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Finding the Fourth Proportional to 82,920.60, 124,380.90 and 20,591.10

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Solution

The fourth proportional to 82,920.60, 124,380.90 and 20,591.10 is: 30,886.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,920.60 : 124,380.90 = 20,591.10 : x
  2. Step 2: Convert to fraction form
    82,920.60/124,380.90 = 20,591.10/x
  3. Step 3: Cross multiply
    82,920.60x = 124,380.90 × 20,591.10
  4. Step 4: Simplify right side
    82,920.60x = 2,561,139,549.99
  5. Step 5: Solve for x
    x = 2,561,139,549.99/82,920.60
  6. Step 6: Final answer
    x = 30,886.65

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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.