Home / 645,456.20-890,741.00-358,976.41

Finding the Fourth Proportional to 645,456.20, 890,741.00 and 358,976.41

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Solution

The fourth proportional to 645,456.20, 890,741.00 and 358,976.41 is: 495,393.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,456.20 : 890,741.00 = 358,976.41 : x
  2. Step 2: Convert to fraction form
    645,456.20/890,741.00 = 358,976.41/x
  3. Step 3: Cross multiply
    645,456.20x = 890,741.00 × 358,976.41
  4. Step 4: Simplify right side
    645,456.20x = 319,755,005,090.40
  5. Step 5: Solve for x
    x = 319,755,005,090.40/645,456.20
  6. Step 6: Final answer
    x = 495,393.81

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Double scale
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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.