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Finding the Fourth Proportional to 747.60, 1,031.61 and 415.98

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Solution

The fourth proportional to 747.60, 1,031.61 and 415.98 is: 574.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.60 : 1,031.61 = 415.98 : x
  2. Step 2: Convert to fraction form
    747.60/1,031.61 = 415.98/x
  3. Step 3: Cross multiply
    747.60x = 1,031.61 × 415.98
  4. Step 4: Simplify right side
    747.60x = 429,129.13
  5. Step 5: Solve for x
    x = 429,129.13/747.60
  6. Step 6: Final answer
    x = 574.01

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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.