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Finding the Fourth Proportional to 769.52, 1,061.90 and 470.70

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Solution

The fourth proportional to 769.52, 1,061.90 and 470.70 is: 649.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.52 : 1,061.90 = 470.70 : x
  2. Step 2: Convert to fraction form
    769.52/1,061.90 = 470.70/x
  3. Step 3: Cross multiply
    769.52x = 1,061.90 × 470.70
  4. Step 4: Simplify right side
    769.52x = 499,833.98
  5. Step 5: Solve for x
    x = 499,833.98/769.52
  6. Step 6: Final answer
    x = 649.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.