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Finding the Fourth Proportional to 765.40, 1,147.96 and 217.47

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Solution

The fourth proportional to 765.40, 1,147.96 and 217.47 is: 326.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.40 : 1,147.96 = 217.47 : x
  2. Step 2: Convert to fraction form
    765.40/1,147.96 = 217.47/x
  3. Step 3: Cross multiply
    765.40x = 1,147.96 × 217.47
  4. Step 4: Simplify right side
    765.40x = 249,646.86
  5. Step 5: Solve for x
    x = 249,646.86/765.40
  6. Step 6: Final answer
    x = 326.17

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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.