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Finding the Fourth Proportional to 713.22, 1,069.80 and 426.48

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Solution

The fourth proportional to 713.22, 1,069.80 and 426.48 is: 639.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.22 : 1,069.80 = 426.48 : x
  2. Step 2: Convert to fraction form
    713.22/1,069.80 = 426.48/x
  3. Step 3: Cross multiply
    713.22x = 1,069.80 × 426.48
  4. Step 4: Simplify right side
    713.22x = 456,248.30
  5. Step 5: Solve for x
    x = 456,248.30/713.22
  6. Step 6: Final answer
    x = 639.70

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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.