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Finding the Fourth Proportional to 747.38, 1,031.90 and 498.98

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Solution

The fourth proportional to 747.38, 1,031.90 and 498.98 is: 688.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.38 : 1,031.90 = 498.98 : x
  2. Step 2: Convert to fraction form
    747.38/1,031.90 = 498.98/x
  3. Step 3: Cross multiply
    747.38x = 1,031.90 × 498.98
  4. Step 4: Simplify right side
    747.38x = 514,889.81
  5. Step 5: Solve for x
    x = 514,889.81/747.38
  6. Step 6: Final answer
    x = 688.93

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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.