Home / 87,990.39-121,221.63-71,981.55

Finding the Fourth Proportional to 87,990.39, 121,221.63 and 71,981.55

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Solution

The fourth proportional to 87,990.39, 121,221.63 and 71,981.55 is: 99,166.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,990.39 : 121,221.63 = 71,981.55 : x
  2. Step 2: Convert to fraction form
    87,990.39/121,221.63 = 71,981.55/x
  3. Step 3: Cross multiply
    87,990.39x = 121,221.63 × 71,981.55
  4. Step 4: Simplify right side
    87,990.39x = 8,725,720,820.93
  5. Step 5: Solve for x
    x = 8,725,720,820.93/87,990.39
  6. Step 6: Final answer
    x = 99,166.75

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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.