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Finding the Fourth Proportional to 1,221.17, 1,832.31 and 892.40

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Solution

The fourth proportional to 1,221.17, 1,832.31 and 892.40 is: 1,339.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.17 : 1,832.31 = 892.40 : x
  2. Step 2: Convert to fraction form
    1,221.17/1,832.31 = 892.40/x
  3. Step 3: Cross multiply
    1,221.17x = 1,832.31 × 892.40
  4. Step 4: Simplify right side
    1,221.17x = 1,635,144.28
  5. Step 5: Solve for x
    x = 1,635,144.28/1,221.17
  6. Step 6: Final answer
    x = 1,339.00

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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.