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Finding the Fourth Proportional to 747.13, 1,120.80 and 260.12

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Solution

The fourth proportional to 747.13, 1,120.80 and 260.12 is: 390.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.13 : 1,120.80 = 260.12 : x
  2. Step 2: Convert to fraction form
    747.13/1,120.80 = 260.12/x
  3. Step 3: Cross multiply
    747.13x = 1,120.80 × 260.12
  4. Step 4: Simplify right side
    747.13x = 291,535.59
  5. Step 5: Solve for x
    x = 291,535.59/747.13
  6. Step 6: Final answer
    x = 390.21

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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.