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Finding the Fourth Proportional to 2,660.52, 3,990.80 and 1,121.52

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Solution

The fourth proportional to 2,660.52, 3,990.80 and 1,121.52 is: 1,682.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.52 : 3,990.80 = 1,121.52 : x
  2. Step 2: Convert to fraction form
    2,660.52/3,990.80 = 1,121.52/x
  3. Step 3: Cross multiply
    2,660.52x = 3,990.80 × 1,121.52
  4. Step 4: Simplify right side
    2,660.52x = 4,475,762.02
  5. Step 5: Solve for x
    x = 4,475,762.02/2,660.52
  6. Step 6: Final answer
    x = 1,682.29

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1.5x scale

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.