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Finding the Fourth Proportional to 1,116, 1,672.56 and 825.12

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Solution

The fourth proportional to 1,116, 1,672.56 and 825.12 is: 1,236.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116 : 1,672.56 = 825.12 : x
  2. Step 2: Convert to fraction form
    1,116/1,672.56 = 825.12/x
  3. Step 3: Cross multiply
    1,116x = 1,672.56 × 825.12
  4. Step 4: Simplify right side
    1,116x = 1,380,062.71
  5. Step 5: Solve for x
    x = 1,380,062.71/1,116
  6. Step 6: Final answer
    x = 1,236.62

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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.