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Finding the Fourth Proportional to 87,687.42, 121,020.40 and 49,454.80

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Solution

The fourth proportional to 87,687.42, 121,020.40 and 49,454.80 is: 68,254.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,687.42 : 121,020.40 = 49,454.80 : x
  2. Step 2: Convert to fraction form
    87,687.42/121,020.40 = 49,454.80/x
  3. Step 3: Cross multiply
    87,687.42x = 121,020.40 × 49,454.80
  4. Step 4: Simplify right side
    87,687.42x = 5,985,039,677.92
  5. Step 5: Solve for x
    x = 5,985,039,677.92/87,687.42
  6. Step 6: Final answer
    x = 68,254.26

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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.