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Finding the Fourth Proportional to 672.76, 1,014.07 and 644.97

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Solution

The fourth proportional to 672.76, 1,014.07 and 644.97 is: 972.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.76 : 1,014.07 = 644.97 : x
  2. Step 2: Convert to fraction form
    672.76/1,014.07 = 644.97/x
  3. Step 3: Cross multiply
    672.76x = 1,014.07 × 644.97
  4. Step 4: Simplify right side
    672.76x = 654,044.73
  5. Step 5: Solve for x
    x = 654,044.73/672.76
  6. Step 6: Final answer
    x = 972.18

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.