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Finding the Fourth Proportional to 747.70, 1,121.68 and 331.36

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Solution

The fourth proportional to 747.70, 1,121.68 and 331.36 is: 497.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.70 : 1,121.68 = 331.36 : x
  2. Step 2: Convert to fraction form
    747.70/1,121.68 = 331.36/x
  3. Step 3: Cross multiply
    747.70x = 1,121.68 × 331.36
  4. Step 4: Simplify right side
    747.70x = 371,679.88
  5. Step 5: Solve for x
    x = 371,679.88/747.70
  6. Step 6: Final answer
    x = 497.10

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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.