Home / 1,139.16-1,572.11-635.15

Finding the Fourth Proportional to 1,139.16, 1,572.11 and 635.15

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Solution

The fourth proportional to 1,139.16, 1,572.11 and 635.15 is: 876.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.16 : 1,572.11 = 635.15 : x
  2. Step 2: Convert to fraction form
    1,139.16/1,572.11 = 635.15/x
  3. Step 3: Cross multiply
    1,139.16x = 1,572.11 × 635.15
  4. Step 4: Simplify right side
    1,139.16x = 998,514.63
  5. Step 5: Solve for x
    x = 998,514.63/1,139.16
  6. Step 6: Final answer
    x = 876.54

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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.