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Finding the Fourth Proportional to 1,139.88, 1,716.24 and 1,003.80

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Solution

The fourth proportional to 1,139.88, 1,716.24 and 1,003.80 is: 1,511.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.88 : 1,716.24 = 1,003.80 : x
  2. Step 2: Convert to fraction form
    1,139.88/1,716.24 = 1,003.80/x
  3. Step 3: Cross multiply
    1,139.88x = 1,716.24 × 1,003.80
  4. Step 4: Simplify right side
    1,139.88x = 1,722,761.71
  5. Step 5: Solve for x
    x = 1,722,761.71/1,139.88
  6. Step 6: Final answer
    x = 1,511.35

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.