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Finding the Fourth Proportional to 769.20, 1,061.28 and 474.72

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Solution

The fourth proportional to 769.20, 1,061.28 and 474.72 is: 654.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.20 : 1,061.28 = 474.72 : x
  2. Step 2: Convert to fraction form
    769.20/1,061.28 = 474.72/x
  3. Step 3: Cross multiply
    769.20x = 1,061.28 × 474.72
  4. Step 4: Simplify right side
    769.20x = 503,810.84
  5. Step 5: Solve for x
    x = 503,810.84/769.20
  6. Step 6: Final answer
    x = 654.98

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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.