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Finding the Fourth Proportional to 931.61, 1,287.42 and 754.22

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Solution

The fourth proportional to 931.61, 1,287.42 and 754.22 is: 1,042.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.61 : 1,287.42 = 754.22 : x
  2. Step 2: Convert to fraction form
    931.61/1,287.42 = 754.22/x
  3. Step 3: Cross multiply
    931.61x = 1,287.42 × 754.22
  4. Step 4: Simplify right side
    931.61x = 970,997.91
  5. Step 5: Solve for x
    x = 970,997.91/931.61
  6. Step 6: Final answer
    x = 1,042.28

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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.