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Finding the Fourth Proportional to 672.43, 1,008.95 and 425.59

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Solution

The fourth proportional to 672.43, 1,008.95 and 425.59 is: 638.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.43 : 1,008.95 = 425.59 : x
  2. Step 2: Convert to fraction form
    672.43/1,008.95 = 425.59/x
  3. Step 3: Cross multiply
    672.43x = 1,008.95 × 425.59
  4. Step 4: Simplify right side
    672.43x = 429,399.03
  5. Step 5: Solve for x
    x = 429,399.03/672.43
  6. Step 6: Final answer
    x = 638.58

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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.