Home / 431,147.40-646,721.10-331,499.40

Finding the Fourth Proportional to 431,147.40, 646,721.10 and 331,499.40

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Solution

The fourth proportional to 431,147.40, 646,721.10 and 331,499.40 is: 497,249.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,147.40 : 646,721.10 = 331,499.40 : x
  2. Step 2: Convert to fraction form
    431,147.40/646,721.10 = 331,499.40/x
  3. Step 3: Cross multiply
    431,147.40x = 646,721.10 × 331,499.40
  4. Step 4: Simplify right side
    431,147.40x = 214,387,656,617.34
  5. Step 5: Solve for x
    x = 214,387,656,617.34/431,147.40
  6. Step 6: Final answer
    x = 497,249.10

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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.