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Finding the Fourth Proportional to 82,990.80, 124,486.20 and 20,661.30

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Solution

The fourth proportional to 82,990.80, 124,486.20 and 20,661.30 is: 30,991.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,990.80 : 124,486.20 = 20,661.30 : x
  2. Step 2: Convert to fraction form
    82,990.80/124,486.20 = 20,661.30/x
  3. Step 3: Cross multiply
    82,990.80x = 124,486.20 × 20,661.30
  4. Step 4: Simplify right side
    82,990.80x = 2,572,046,724.06
  5. Step 5: Solve for x
    x = 2,572,046,724.06/82,990.80
  6. Step 6: Final answer
    x = 30,991.95

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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.