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Finding the Fourth Proportional to 765.71, 1,146.51 and 399.73

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Solution

The fourth proportional to 765.71, 1,146.51 and 399.73 is: 598.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.71 : 1,146.51 = 399.73 : x
  2. Step 2: Convert to fraction form
    765.71/1,146.51 = 399.73/x
  3. Step 3: Cross multiply
    765.71x = 1,146.51 × 399.73
  4. Step 4: Simplify right side
    765.71x = 458,293.73
  5. Step 5: Solve for x
    x = 458,293.73/765.71
  6. Step 6: Final answer
    x = 598.52

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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.