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Finding the Fourth Proportional to 1,201.17, 1,801.80 and 741.90

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Solution

The fourth proportional to 1,201.17, 1,801.80 and 741.90 is: 1,112.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.17 : 1,801.80 = 741.90 : x
  2. Step 2: Convert to fraction form
    1,201.17/1,801.80 = 741.90/x
  3. Step 3: Cross multiply
    1,201.17x = 1,801.80 × 741.90
  4. Step 4: Simplify right side
    1,201.17x = 1,336,755.42
  5. Step 5: Solve for x
    x = 1,336,755.42/1,201.17
  6. Step 6: Final answer
    x = 1,112.88

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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.