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Finding the Fourth Proportional to 1,120.33, 1,545.63 and 721.91

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Solution

The fourth proportional to 1,120.33, 1,545.63 and 721.91 is: 995.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.33 : 1,545.63 = 721.91 : x
  2. Step 2: Convert to fraction form
    1,120.33/1,545.63 = 721.91/x
  3. Step 3: Cross multiply
    1,120.33x = 1,545.63 × 721.91
  4. Step 4: Simplify right side
    1,120.33x = 1,115,810.97
  5. Step 5: Solve for x
    x = 1,115,810.97/1,120.33
  6. Step 6: Final answer
    x = 995.97

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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.