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Finding the Fourth Proportional to 747.58, 1,121.38 and 308.76

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Solution

The fourth proportional to 747.58, 1,121.38 and 308.76 is: 463.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.58 : 1,121.38 = 308.76 : x
  2. Step 2: Convert to fraction form
    747.58/1,121.38 = 308.76/x
  3. Step 3: Cross multiply
    747.58x = 1,121.38 × 308.76
  4. Step 4: Simplify right side
    747.58x = 346,235.75
  5. Step 5: Solve for x
    x = 346,235.75/747.58
  6. Step 6: Final answer
    x = 463.14

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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.