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Finding the Fourth Proportional to 2,660.20, 3,990.34 and 712.38

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Solution

The fourth proportional to 2,660.20, 3,990.34 and 712.38 is: 1,068.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.20 : 3,990.34 = 712.38 : x
  2. Step 2: Convert to fraction form
    2,660.20/3,990.34 = 712.38/x
  3. Step 3: Cross multiply
    2,660.20x = 3,990.34 × 712.38
  4. Step 4: Simplify right side
    2,660.20x = 2,842,638.41
  5. Step 5: Solve for x
    x = 2,842,638.41/2,660.20
  6. Step 6: Final answer
    x = 1,068.58

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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.