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Finding the Fourth Proportional to 81,000.80, 121,501.20 and 45,571.40

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Solution

The fourth proportional to 81,000.80, 121,501.20 and 45,571.40 is: 68,357.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,000.80 : 121,501.20 = 45,571.40 : x
  2. Step 2: Convert to fraction form
    81,000.80/121,501.20 = 45,571.40/x
  3. Step 3: Cross multiply
    81,000.80x = 121,501.20 × 45,571.40
  4. Step 4: Simplify right side
    81,000.80x = 5,536,979,785.68
  5. Step 5: Solve for x
    x = 5,536,979,785.68/81,000.80
  6. Step 6: Final answer
    x = 68,357.10

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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.