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Finding the Fourth Proportional to 747.22, 1,031.21 and 415.72

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Solution

The fourth proportional to 747.22, 1,031.21 and 415.72 is: 573.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.22 : 1,031.21 = 415.72 : x
  2. Step 2: Convert to fraction form
    747.22/1,031.21 = 415.72/x
  3. Step 3: Cross multiply
    747.22x = 1,031.21 × 415.72
  4. Step 4: Simplify right side
    747.22x = 428,694.62
  5. Step 5: Solve for x
    x = 428,694.62/747.22
  6. Step 6: Final answer
    x = 573.72

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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.