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Finding the Fourth Proportional to 672.60, 1,001.85 and 641.02

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Solution

The fourth proportional to 672.60, 1,001.85 and 641.02 is: 954.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.60 : 1,001.85 = 641.02 : x
  2. Step 2: Convert to fraction form
    672.60/1,001.85 = 641.02/x
  3. Step 3: Cross multiply
    672.60x = 1,001.85 × 641.02
  4. Step 4: Simplify right side
    672.60x = 642,205.89
  5. Step 5: Solve for x
    x = 642,205.89/672.60
  6. Step 6: Final answer
    x = 954.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.