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Finding the Fourth Proportional to 747.30, 1,121.53 and 517.80

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Solution

The fourth proportional to 747.30, 1,121.53 and 517.80 is: 777.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.30 : 1,121.53 = 517.80 : x
  2. Step 2: Convert to fraction form
    747.30/1,121.53 = 517.80/x
  3. Step 3: Cross multiply
    747.30x = 1,121.53 × 517.80
  4. Step 4: Simplify right side
    747.30x = 580,725.43
  5. Step 5: Solve for x
    x = 580,725.43/747.30
  6. Step 6: Final answer
    x = 777.10

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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.