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Finding the Fourth Proportional to 1,139.65, 1,572.62 and 635.48

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Solution

The fourth proportional to 1,139.65, 1,572.62 and 635.48 is: 876.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.65 : 1,572.62 = 635.48 : x
  2. Step 2: Convert to fraction form
    1,139.65/1,572.62 = 635.48/x
  3. Step 3: Cross multiply
    1,139.65x = 1,572.62 × 635.48
  4. Step 4: Simplify right side
    1,139.65x = 999,368.56
  5. Step 5: Solve for x
    x = 999,368.56/1,139.65
  6. Step 6: Final answer
    x = 876.91

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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.