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Finding the Fourth Proportional to 2,712.55, 4,068.82 and 660.55

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Solution

The fourth proportional to 2,712.55, 4,068.82 and 660.55 is: 990.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,712.55 : 4,068.82 = 660.55 : x
  2. Step 2: Convert to fraction form
    2,712.55/4,068.82 = 660.55/x
  3. Step 3: Cross multiply
    2,712.55x = 4,068.82 × 660.55
  4. Step 4: Simplify right side
    2,712.55x = 2,687,659.05
  5. Step 5: Solve for x
    x = 2,687,659.05/2,712.55
  6. Step 6: Final answer
    x = 990.82

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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.