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Finding the Fourth Proportional to 615,287.40, 921,375.90 and 403,780.20

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Solution

The fourth proportional to 615,287.40, 921,375.90 and 403,780.20 is: 604,649.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,287.40 : 921,375.90 = 403,780.20 : x
  2. Step 2: Convert to fraction form
    615,287.40/921,375.90 = 403,780.20/x
  3. Step 3: Cross multiply
    615,287.40x = 921,375.90 × 403,780.20
  4. Step 4: Simplify right side
    615,287.40x = 372,033,345,177.18
  5. Step 5: Solve for x
    x = 372,033,345,177.18/615,287.40
  6. Step 6: Final answer
    x = 604,649.71

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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.