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Finding the Fourth Proportional to 1,661.80, 2,492.70 and 687.92

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Solution

The fourth proportional to 1,661.80, 2,492.70 and 687.92 is: 1,031.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,661.80 : 2,492.70 = 687.92 : x
  2. Step 2: Convert to fraction form
    1,661.80/2,492.70 = 687.92/x
  3. Step 3: Cross multiply
    1,661.80x = 2,492.70 × 687.92
  4. Step 4: Simplify right side
    1,661.80x = 1,714,778.18
  5. Step 5: Solve for x
    x = 1,714,778.18/1,661.80
  6. Step 6: Final answer
    x = 1,031.88

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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.