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Finding the Fourth Proportional to 714.88, 1,071.92 and 426.52

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Solution

The fourth proportional to 714.88, 1,071.92 and 426.52 is: 639.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.88 : 1,071.92 = 426.52 : x
  2. Step 2: Convert to fraction form
    714.88/1,071.92 = 426.52/x
  3. Step 3: Cross multiply
    714.88x = 1,071.92 × 426.52
  4. Step 4: Simplify right side
    714.88x = 457,195.32
  5. Step 5: Solve for x
    x = 457,195.32/714.88
  6. Step 6: Final answer
    x = 639.54

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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.