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Finding the Fourth Proportional to 991.22, 1,476.36 and 939.18

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Solution

The fourth proportional to 991.22, 1,476.36 and 939.18 is: 1,398.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.22 : 1,476.36 = 939.18 : x
  2. Step 2: Convert to fraction form
    991.22/1,476.36 = 939.18/x
  3. Step 3: Cross multiply
    991.22x = 1,476.36 × 939.18
  4. Step 4: Simplify right side
    991.22x = 1,386,567.78
  5. Step 5: Solve for x
    x = 1,386,567.78/991.22
  6. Step 6: Final answer
    x = 1,398.86

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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.