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Finding the Fourth Proportional to 80,999.40, 121,499.10 and 28,414.20

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Solution

The fourth proportional to 80,999.40, 121,499.10 and 28,414.20 is: 42,621.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,999.40 : 121,499.10 = 28,414.20 : x
  2. Step 2: Convert to fraction form
    80,999.40/121,499.10 = 28,414.20/x
  3. Step 3: Cross multiply
    80,999.40x = 121,499.10 × 28,414.20
  4. Step 4: Simplify right side
    80,999.40x = 3,452,299,727.22
  5. Step 5: Solve for x
    x = 3,452,299,727.22/80,999.40
  6. Step 6: Final answer
    x = 42,621.30

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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.