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Finding the Fourth Proportional to 672.89, 1,008.77 and 438.80

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Solution

The fourth proportional to 672.89, 1,008.77 and 438.80 is: 657.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.89 : 1,008.77 = 438.80 : x
  2. Step 2: Convert to fraction form
    672.89/1,008.77 = 438.80/x
  3. Step 3: Cross multiply
    672.89x = 1,008.77 × 438.80
  4. Step 4: Simplify right side
    672.89x = 442,641.04
  5. Step 5: Solve for x
    x = 442,641.04/672.89
  6. Step 6: Final answer
    x = 657.83

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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.