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Finding the Fourth Proportional to 747.18, 1,031.28 and 498.51

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Solution

The fourth proportional to 747.18, 1,031.28 and 498.51 is: 688.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.18 : 1,031.28 = 498.51 : x
  2. Step 2: Convert to fraction form
    747.18/1,031.28 = 498.51/x
  3. Step 3: Cross multiply
    747.18x = 1,031.28 × 498.51
  4. Step 4: Simplify right side
    747.18x = 514,101.52
  5. Step 5: Solve for x
    x = 514,101.52/747.18
  6. Step 6: Final answer
    x = 688.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.