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Finding the Fourth Proportional to 769.47, 1,153.70 and 379.12

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Solution

The fourth proportional to 769.47, 1,153.70 and 379.12 is: 568.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.47 : 1,153.70 = 379.12 : x
  2. Step 2: Convert to fraction form
    769.47/1,153.70 = 379.12/x
  3. Step 3: Cross multiply
    769.47x = 1,153.70 × 379.12
  4. Step 4: Simplify right side
    769.47x = 437,390.74
  5. Step 5: Solve for x
    x = 437,390.74/769.47
  6. Step 6: Final answer
    x = 568.43

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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.