Home / 128,220.60-176,882.22-90,411.96

Finding the Fourth Proportional to 128,220.60, 176,882.22 and 90,411.96

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Solution

The fourth proportional to 128,220.60, 176,882.22 and 90,411.96 is: 124,724.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,220.60 : 176,882.22 = 90,411.96 : x
  2. Step 2: Convert to fraction form
    128,220.60/176,882.22 = 90,411.96/x
  3. Step 3: Cross multiply
    128,220.60x = 176,882.22 × 90,411.96
  4. Step 4: Simplify right side
    128,220.60x = 15,992,268,199.35
  5. Step 5: Solve for x
    x = 15,992,268,199.35/128,220.60
  6. Step 6: Final answer
    x = 124,724.64

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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.