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Finding the Fourth Proportional to 2,781.76, 3,838.82 and 1,539.76

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Solution

The fourth proportional to 2,781.76, 3,838.82 and 1,539.76 is: 2,124.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,781.76 : 3,838.82 = 1,539.76 : x
  2. Step 2: Convert to fraction form
    2,781.76/3,838.82 = 1,539.76/x
  3. Step 3: Cross multiply
    2,781.76x = 3,838.82 × 1,539.76
  4. Step 4: Simplify right side
    2,781.76x = 5,910,861.48
  5. Step 5: Solve for x
    x = 5,910,861.48/2,781.76
  6. Step 6: Final answer
    x = 2,124.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.