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Finding the Fourth Proportional to 768.62, 1,154.48 and 747.11

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Solution

The fourth proportional to 768.62, 1,154.48 and 747.11 is: 1,122.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.62 : 1,154.48 = 747.11 : x
  2. Step 2: Convert to fraction form
    768.62/1,154.48 = 747.11/x
  3. Step 3: Cross multiply
    768.62x = 1,154.48 × 747.11
  4. Step 4: Simplify right side
    768.62x = 862,514.04
  5. Step 5: Solve for x
    x = 862,514.04/768.62
  6. Step 6: Final answer
    x = 1,122.17

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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.