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Finding the Fourth Proportional to 1,098.46, 1,512.60 and 939.94

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Solution

The fourth proportional to 1,098.46, 1,512.60 and 939.94 is: 1,294.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.46 : 1,512.60 = 939.94 : x
  2. Step 2: Convert to fraction form
    1,098.46/1,512.60 = 939.94/x
  3. Step 3: Cross multiply
    1,098.46x = 1,512.60 × 939.94
  4. Step 4: Simplify right side
    1,098.46x = 1,421,753.24
  5. Step 5: Solve for x
    x = 1,421,753.24/1,098.46
  6. Step 6: Final answer
    x = 1,294.31

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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.