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Finding the Fourth Proportional to 713.28, 1,069.95 and 348.39

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Solution

The fourth proportional to 713.28, 1,069.95 and 348.39 is: 522.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.28 : 1,069.95 = 348.39 : x
  2. Step 2: Convert to fraction form
    713.28/1,069.95 = 348.39/x
  3. Step 3: Cross multiply
    713.28x = 1,069.95 × 348.39
  4. Step 4: Simplify right side
    713.28x = 372,759.88
  5. Step 5: Solve for x
    x = 372,759.88/713.28
  6. Step 6: Final answer
    x = 522.60

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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.