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Finding the Fourth Proportional to 939.13, 1,295.47 and 728.97

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Solution

The fourth proportional to 939.13, 1,295.47 and 728.97 is: 1,005.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.13 : 1,295.47 = 728.97 : x
  2. Step 2: Convert to fraction form
    939.13/1,295.47 = 728.97/x
  3. Step 3: Cross multiply
    939.13x = 1,295.47 × 728.97
  4. Step 4: Simplify right side
    939.13x = 944,358.77
  5. Step 5: Solve for x
    x = 944,358.77/939.13
  6. Step 6: Final answer
    x = 1,005.57

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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.