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Finding the Fourth Proportional to 765.59, 1,147.91 and 271.71

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Solution

The fourth proportional to 765.59, 1,147.91 and 271.71 is: 407.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.59 : 1,147.91 = 271.71 : x
  2. Step 2: Convert to fraction form
    765.59/1,147.91 = 271.71/x
  3. Step 3: Cross multiply
    765.59x = 1,147.91 × 271.71
  4. Step 4: Simplify right side
    765.59x = 311,897.27
  5. Step 5: Solve for x
    x = 311,897.27/765.59
  6. Step 6: Final answer
    x = 407.40

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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.