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Finding the Fourth Proportional to 81,230.80, 121,846.20 and 75,325.90

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Solution

The fourth proportional to 81,230.80, 121,846.20 and 75,325.90 is: 112,988.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,230.80 : 121,846.20 = 75,325.90 : x
  2. Step 2: Convert to fraction form
    81,230.80/121,846.20 = 75,325.90/x
  3. Step 3: Cross multiply
    81,230.80x = 121,846.20 × 75,325.90
  4. Step 4: Simplify right side
    81,230.80x = 9,178,174,676.58
  5. Step 5: Solve for x
    x = 9,178,174,676.58/81,230.80
  6. Step 6: Final answer
    x = 112,988.85

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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.