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Finding the Fourth Proportional to 87,103.76, 120,056.84 and 66,678.80

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Solution

The fourth proportional to 87,103.76, 120,056.84 and 66,678.80 is: 91,904.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,103.76 : 120,056.84 = 66,678.80 : x
  2. Step 2: Convert to fraction form
    87,103.76/120,056.84 = 66,678.80/x
  3. Step 3: Cross multiply
    87,103.76x = 120,056.84 × 66,678.80
  4. Step 4: Simplify right side
    87,103.76x = 8,005,246,022.99
  5. Step 5: Solve for x
    x = 8,005,246,022.99/87,103.76
  6. Step 6: Final answer
    x = 91,904.71

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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.