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Finding the Fourth Proportional to 645,459.77, 890,710.79 and 358,998.30

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Solution

The fourth proportional to 645,459.77, 890,710.79 and 358,998.30 is: 495,404.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,459.77 : 890,710.79 = 358,998.30 : x
  2. Step 2: Convert to fraction form
    645,459.77/890,710.79 = 358,998.30/x
  3. Step 3: Cross multiply
    645,459.77x = 890,710.79 × 358,998.30
  4. Step 4: Simplify right side
    645,459.77x = 319,763,657,606.67
  5. Step 5: Solve for x
    x = 319,763,657,606.67/645,459.77
  6. Step 6: Final answer
    x = 495,404.47

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.