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Finding the Fourth Proportional to 1,090.16, 1,641.06 and 939.45

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Solution

The fourth proportional to 1,090.16, 1,641.06 and 939.45 is: 1,414.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.16 : 1,641.06 = 939.45 : x
  2. Step 2: Convert to fraction form
    1,090.16/1,641.06 = 939.45/x
  3. Step 3: Cross multiply
    1,090.16x = 1,641.06 × 939.45
  4. Step 4: Simplify right side
    1,090.16x = 1,541,685.61
  5. Step 5: Solve for x
    x = 1,541,685.61/1,090.16
  6. Step 6: Final answer
    x = 1,414.19

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.