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Finding the Fourth Proportional to 2,660.61, 3,990.85 and 712.75

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Solution

The fourth proportional to 2,660.61, 3,990.85 and 712.75 is: 1,069.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.61 : 3,990.85 = 712.75 : x
  2. Step 2: Convert to fraction form
    2,660.61/3,990.85 = 712.75/x
  3. Step 3: Cross multiply
    2,660.61x = 3,990.85 × 712.75
  4. Step 4: Simplify right side
    2,660.61x = 2,844,478.34
  5. Step 5: Solve for x
    x = 2,844,478.34/2,660.61
  6. Step 6: Final answer
    x = 1,069.11

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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.