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Finding the Fourth Proportional to 865.72, 1,292.31 and 801.49

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Solution

The fourth proportional to 865.72, 1,292.31 and 801.49 is: 1,196.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.72 : 1,292.31 = 801.49 : x
  2. Step 2: Convert to fraction form
    865.72/1,292.31 = 801.49/x
  3. Step 3: Cross multiply
    865.72x = 1,292.31 × 801.49
  4. Step 4: Simplify right side
    865.72x = 1,035,763.07
  5. Step 5: Solve for x
    x = 1,035,763.07/865.72
  6. Step 6: Final answer
    x = 1,196.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.