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Finding the Fourth Proportional to 769.28, 1,061.36 and 437.70

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Solution

The fourth proportional to 769.28, 1,061.36 and 437.70 is: 603.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.28 : 1,061.36 = 437.70 : x
  2. Step 2: Convert to fraction form
    769.28/1,061.36 = 437.70/x
  3. Step 3: Cross multiply
    769.28x = 1,061.36 × 437.70
  4. Step 4: Simplify right side
    769.28x = 464,555.08
  5. Step 5: Solve for x
    x = 464,555.08/769.28
  6. Step 6: Final answer
    x = 603.89

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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.