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Finding the Fourth Proportional to 640,923.40, 961,385.10 and 303,963.40

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Solution

The fourth proportional to 640,923.40, 961,385.10 and 303,963.40 is: 455,945.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,923.40 : 961,385.10 = 303,963.40 : x
  2. Step 2: Convert to fraction form
    640,923.40/961,385.10 = 303,963.40/x
  3. Step 3: Cross multiply
    640,923.40x = 961,385.10 × 303,963.40
  4. Step 4: Simplify right side
    640,923.40x = 292,225,883,705.34
  5. Step 5: Solve for x
    x = 292,225,883,705.34/640,923.40
  6. Step 6: Final answer
    x = 455,945.10

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.