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Finding the Fourth Proportional to 121,403.80, 182,105.70 and 85,974.40

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Solution

The fourth proportional to 121,403.80, 182,105.70 and 85,974.40 is: 128,961.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,403.80 : 182,105.70 = 85,974.40 : x
  2. Step 2: Convert to fraction form
    121,403.80/182,105.70 = 85,974.40/x
  3. Step 3: Cross multiply
    121,403.80x = 182,105.70 × 85,974.40
  4. Step 4: Simplify right side
    121,403.80x = 15,656,428,294.08
  5. Step 5: Solve for x
    x = 15,656,428,294.08/121,403.80
  6. Step 6: Final answer
    x = 128,961.60

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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.