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Finding the Fourth Proportional to 713.28, 1,069.89 and 424.50

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Solution

The fourth proportional to 713.28, 1,069.89 and 424.50 is: 636.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.28 : 1,069.89 = 424.50 : x
  2. Step 2: Convert to fraction form
    713.28/1,069.89 = 424.50/x
  3. Step 3: Cross multiply
    713.28x = 1,069.89 × 424.50
  4. Step 4: Simplify right side
    713.28x = 454,168.31
  5. Step 5: Solve for x
    x = 454,168.31/713.28
  6. Step 6: Final answer
    x = 636.73

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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.