Home / 121,921.40-182,882.10-90,817.40

Finding the Fourth Proportional to 121,921.40, 182,882.10 and 90,817.40

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Solution

The fourth proportional to 121,921.40, 182,882.10 and 90,817.40 is: 136,226.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,921.40 : 182,882.10 = 90,817.40 : x
  2. Step 2: Convert to fraction form
    121,921.40/182,882.10 = 90,817.40/x
  3. Step 3: Cross multiply
    121,921.40x = 182,882.10 × 90,817.40
  4. Step 4: Simplify right side
    121,921.40x = 16,608,876,828.54
  5. Step 5: Solve for x
    x = 16,608,876,828.54/121,921.40
  6. Step 6: Final answer
    x = 136,226.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.