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Finding the Fourth Proportional to 1,139.38, 1,572.12 and 673.66

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Solution

The fourth proportional to 1,139.38, 1,572.12 and 673.66 is: 929.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.38 : 1,572.12 = 673.66 : x
  2. Step 2: Convert to fraction form
    1,139.38/1,572.12 = 673.66/x
  3. Step 3: Cross multiply
    1,139.38x = 1,572.12 × 673.66
  4. Step 4: Simplify right side
    1,139.38x = 1,059,074.36
  5. Step 5: Solve for x
    x = 1,059,074.36/1,139.38
  6. Step 6: Final answer
    x = 929.52

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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.