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Finding the Fourth Proportional to 499.61, 689.72 and 387.33

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Solution

The fourth proportional to 499.61, 689.72 and 387.33 is: 534.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.61 : 689.72 = 387.33 : x
  2. Step 2: Convert to fraction form
    499.61/689.72 = 387.33/x
  3. Step 3: Cross multiply
    499.61x = 689.72 × 387.33
  4. Step 4: Simplify right side
    499.61x = 267,151.83
  5. Step 5: Solve for x
    x = 267,151.83/499.61
  6. Step 6: Final answer
    x = 534.72

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.