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Finding the Fourth Proportional to 765.17, 1,147.75 and 217.35

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Solution

The fourth proportional to 765.17, 1,147.75 and 217.35 is: 326.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.17 : 1,147.75 = 217.35 : x
  2. Step 2: Convert to fraction form
    765.17/1,147.75 = 217.35/x
  3. Step 3: Cross multiply
    765.17x = 1,147.75 × 217.35
  4. Step 4: Simplify right side
    765.17x = 249,462.92
  5. Step 5: Solve for x
    x = 249,462.92/765.17
  6. Step 6: Final answer
    x = 326.03

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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.