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Finding the Fourth Proportional to 761.60, 1,144.80 and 747.20

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Solution

The fourth proportional to 761.60, 1,144.80 and 747.20 is: 1,123.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.60 : 1,144.80 = 747.20 : x
  2. Step 2: Convert to fraction form
    761.60/1,144.80 = 747.20/x
  3. Step 3: Cross multiply
    761.60x = 1,144.80 × 747.20
  4. Step 4: Simplify right side
    761.60x = 855,394.56
  5. Step 5: Solve for x
    x = 855,394.56/761.60
  6. Step 6: Final answer
    x = 1,123.15

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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.