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Finding the Fourth Proportional to 121,044.80, 181,208.80 and 90,017.60

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Solution

The fourth proportional to 121,044.80, 181,208.80 and 90,017.60 is: 134,759.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,044.80 : 181,208.80 = 90,017.60 : x
  2. Step 2: Convert to fraction form
    121,044.80/181,208.80 = 90,017.60/x
  3. Step 3: Cross multiply
    121,044.80x = 181,208.80 × 90,017.60
  4. Step 4: Simplify right side
    121,044.80x = 16,311,981,274.88
  5. Step 5: Solve for x
    x = 16,311,981,274.88/121,044.80
  6. Step 6: Final answer
    x = 134,759.87

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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.