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Finding the Fourth Proportional to 121,281.20, 181,921.80 and 85,851.80

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Solution

The fourth proportional to 121,281.20, 181,921.80 and 85,851.80 is: 128,777.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,281.20 : 181,921.80 = 85,851.80 : x
  2. Step 2: Convert to fraction form
    121,281.20/181,921.80 = 85,851.80/x
  3. Step 3: Cross multiply
    121,281.20x = 181,921.80 × 85,851.80
  4. Step 4: Simplify right side
    121,281.20x = 15,618,313,989.24
  5. Step 5: Solve for x
    x = 15,618,313,989.24/121,281.20
  6. Step 6: Final answer
    x = 128,777.70

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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.