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Finding the Fourth Proportional to 1,139.22, 1,572.14 and 667.44

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Solution

The fourth proportional to 1,139.22, 1,572.14 and 667.44 is: 921.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.22 : 1,572.14 = 667.44 : x
  2. Step 2: Convert to fraction form
    1,139.22/1,572.14 = 667.44/x
  3. Step 3: Cross multiply
    1,139.22x = 1,572.14 × 667.44
  4. Step 4: Simplify right side
    1,139.22x = 1,049,309.12
  5. Step 5: Solve for x
    x = 1,049,309.12/1,139.22
  6. Step 6: Final answer
    x = 921.08

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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.