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Finding the Fourth Proportional to 615,288.40, 921,377.40 and 403,781.20

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Solution

The fourth proportional to 615,288.40, 921,377.40 and 403,781.20 is: 604,651.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,288.40 : 921,377.40 = 403,781.20 : x
  2. Step 2: Convert to fraction form
    615,288.40/921,377.40 = 403,781.20/x
  3. Step 3: Cross multiply
    615,288.40x = 921,377.40 × 403,781.20
  4. Step 4: Simplify right side
    615,288.40x = 372,034,872,224.88
  5. Step 5: Solve for x
    x = 372,034,872,224.88/615,288.40
  6. Step 6: Final answer
    x = 604,651.20

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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.