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Finding the Fourth Proportional to 1,139.90, 1,572.97 and 667.73

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Solution

The fourth proportional to 1,139.90, 1,572.97 and 667.73 is: 921.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.90 : 1,572.97 = 667.73 : x
  2. Step 2: Convert to fraction form
    1,139.90/1,572.97 = 667.73/x
  3. Step 3: Cross multiply
    1,139.90x = 1,572.97 × 667.73
  4. Step 4: Simplify right side
    1,139.90x = 1,050,315.92
  5. Step 5: Solve for x
    x = 1,050,315.92/1,139.90
  6. Step 6: Final answer
    x = 921.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.