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Finding the Fourth Proportional to 81,000.20, 121,411.20 and 28,382.60

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Solution

The fourth proportional to 81,000.20, 121,411.20 and 28,382.60 is: 42,542.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,000.20 : 121,411.20 = 28,382.60 : x
  2. Step 2: Convert to fraction form
    81,000.20/121,411.20 = 28,382.60/x
  3. Step 3: Cross multiply
    81,000.20x = 121,411.20 × 28,382.60
  4. Step 4: Simplify right side
    81,000.20x = 3,445,965,525.12
  5. Step 5: Solve for x
    x = 3,445,965,525.12/81,000.20
  6. Step 6: Final answer
    x = 42,542.68

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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.