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Finding the Fourth Proportional to 2,660.32, 3,989.84 and 1,292

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Solution

The fourth proportional to 2,660.32, 3,989.84 and 1,292 is: 1,937.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.32 : 3,989.84 = 1,292 : x
  2. Step 2: Convert to fraction form
    2,660.32/3,989.84 = 1,292/x
  3. Step 3: Cross multiply
    2,660.32x = 3,989.84 × 1,292
  4. Step 4: Simplify right side
    2,660.32x = 5,154,873.28
  5. Step 5: Solve for x
    x = 5,154,873.28/2,660.32
  6. Step 6: Final answer
    x = 1,937.69

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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.