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Finding the Fourth Proportional to 1,116.49, 1,540.44 and 879.70

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Solution

The fourth proportional to 1,116.49, 1,540.44 and 879.70 is: 1,213.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.49 : 1,540.44 = 879.70 : x
  2. Step 2: Convert to fraction form
    1,116.49/1,540.44 = 879.70/x
  3. Step 3: Cross multiply
    1,116.49x = 1,540.44 × 879.70
  4. Step 4: Simplify right side
    1,116.49x = 1,355,125.07
  5. Step 5: Solve for x
    x = 1,355,125.07/1,116.49
  6. Step 6: Final answer
    x = 1,213.74

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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.