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Finding the Fourth Proportional to 765.66, 1,148.31 and 217.71

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Solution

The fourth proportional to 765.66, 1,148.31 and 217.71 is: 326.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.66 : 1,148.31 = 217.71 : x
  2. Step 2: Convert to fraction form
    765.66/1,148.31 = 217.71/x
  3. Step 3: Cross multiply
    765.66x = 1,148.31 × 217.71
  4. Step 4: Simplify right side
    765.66x = 249,998.57
  5. Step 5: Solve for x
    x = 249,998.57/765.66
  6. Step 6: Final answer
    x = 326.51

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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.