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Finding the Fourth Proportional to 1,132.05, 1,694.88 and 720.17

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Solution

The fourth proportional to 1,132.05, 1,694.88 and 720.17 is: 1,078.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,132.05 : 1,694.88 = 720.17 : x
  2. Step 2: Convert to fraction form
    1,132.05/1,694.88 = 720.17/x
  3. Step 3: Cross multiply
    1,132.05x = 1,694.88 × 720.17
  4. Step 4: Simplify right side
    1,132.05x = 1,220,601.73
  5. Step 5: Solve for x
    x = 1,220,601.73/1,132.05
  6. Step 6: Final answer
    x = 1,078.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.