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Finding the Fourth Proportional to 1,116.78, 1,540.89 and 723.75

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Solution

The fourth proportional to 1,116.78, 1,540.89 and 723.75 is: 998.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.78 : 1,540.89 = 723.75 : x
  2. Step 2: Convert to fraction form
    1,116.78/1,540.89 = 723.75/x
  3. Step 3: Cross multiply
    1,116.78x = 1,540.89 × 723.75
  4. Step 4: Simplify right side
    1,116.78x = 1,115,219.14
  5. Step 5: Solve for x
    x = 1,115,219.14/1,116.78
  6. Step 6: Final answer
    x = 998.60

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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.