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Finding the Fourth Proportional to 1,139.54, 1,572.60 and 635.41

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Solution

The fourth proportional to 1,139.54, 1,572.60 and 635.41 is: 876.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.54 : 1,572.60 = 635.41 : x
  2. Step 2: Convert to fraction form
    1,139.54/1,572.60 = 635.41/x
  3. Step 3: Cross multiply
    1,139.54x = 1,572.60 × 635.41
  4. Step 4: Simplify right side
    1,139.54x = 999,250.11
  5. Step 5: Solve for x
    x = 999,250.11/1,139.54
  6. Step 6: Final answer
    x = 876.89

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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.