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Finding the Fourth Proportional to 1,105.60, 1,655.88 and 939.28

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Solution

The fourth proportional to 1,105.60, 1,655.88 and 939.28 is: 1,406.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.60 : 1,655.88 = 939.28 : x
  2. Step 2: Convert to fraction form
    1,105.60/1,655.88 = 939.28/x
  3. Step 3: Cross multiply
    1,105.60x = 1,655.88 × 939.28
  4. Step 4: Simplify right side
    1,105.60x = 1,555,334.97
  5. Step 5: Solve for x
    x = 1,555,334.97/1,105.60
  6. Step 6: Final answer
    x = 1,406.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.