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Finding the Fourth Proportional to 747.60, 1,031.96 and 485.52

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Solution

The fourth proportional to 747.60, 1,031.96 and 485.52 is: 670.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.60 : 1,031.96 = 485.52 : x
  2. Step 2: Convert to fraction form
    747.60/1,031.96 = 485.52/x
  3. Step 3: Cross multiply
    747.60x = 1,031.96 × 485.52
  4. Step 4: Simplify right side
    747.60x = 501,037.22
  5. Step 5: Solve for x
    x = 501,037.22/747.60
  6. Step 6: Final answer
    x = 670.19

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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.