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Finding the Fourth Proportional to 747.39, 1,031.37 and 415.80

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Solution

The fourth proportional to 747.39, 1,031.37 and 415.80 is: 573.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.39 : 1,031.37 = 415.80 : x
  2. Step 2: Convert to fraction form
    747.39/1,031.37 = 415.80/x
  3. Step 3: Cross multiply
    747.39x = 1,031.37 × 415.80
  4. Step 4: Simplify right side
    747.39x = 428,843.65
  5. Step 5: Solve for x
    x = 428,843.65/747.39
  6. Step 6: Final answer
    x = 573.79

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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.