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Finding the Fourth Proportional to 747.20, 1,031.05 and 415.54

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Solution

The fourth proportional to 747.20, 1,031.05 and 415.54 is: 573.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.20 : 1,031.05 = 415.54 : x
  2. Step 2: Convert to fraction form
    747.20/1,031.05 = 415.54/x
  3. Step 3: Cross multiply
    747.20x = 1,031.05 × 415.54
  4. Step 4: Simplify right side
    747.20x = 428,442.52
  5. Step 5: Solve for x
    x = 428,442.52/747.20
  6. Step 6: Final answer
    x = 573.40

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1.5x scale

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.