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Finding the Fourth Proportional to 750.47, 1,031.67 and 645.17

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Solution

The fourth proportional to 750.47, 1,031.67 and 645.17 is: 886.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.47 : 1,031.67 = 645.17 : x
  2. Step 2: Convert to fraction form
    750.47/1,031.67 = 645.17/x
  3. Step 3: Cross multiply
    750.47x = 1,031.67 × 645.17
  4. Step 4: Simplify right side
    750.47x = 665,597.38
  5. Step 5: Solve for x
    x = 665,597.38/750.47
  6. Step 6: Final answer
    x = 886.91

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.