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Finding the Fourth Proportional to 672.11, 1,006.19 and 655.55

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Solution

The fourth proportional to 672.11, 1,006.19 and 655.55 is: 981.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.11 : 1,006.19 = 655.55 : x
  2. Step 2: Convert to fraction form
    672.11/1,006.19 = 655.55/x
  3. Step 3: Cross multiply
    672.11x = 1,006.19 × 655.55
  4. Step 4: Simplify right side
    672.11x = 659,604.58
  5. Step 5: Solve for x
    x = 659,604.58/672.11
  6. Step 6: Final answer
    x = 981.39

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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.