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Finding the Fourth Proportional to 747.28, 1,120.80 and 260.32

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Solution

The fourth proportional to 747.28, 1,120.80 and 260.32 is: 390.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.28 : 1,120.80 = 260.32 : x
  2. Step 2: Convert to fraction form
    747.28/1,120.80 = 260.32/x
  3. Step 3: Cross multiply
    747.28x = 1,120.80 × 260.32
  4. Step 4: Simplify right side
    747.28x = 291,766.66
  5. Step 5: Solve for x
    x = 291,766.66/747.28
  6. Step 6: Final answer
    x = 390.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.