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Finding the Fourth Proportional to 82,969.68, 124,454.25 and 20,640.18

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Solution

The fourth proportional to 82,969.68, 124,454.25 and 20,640.18 is: 30,960.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,969.68 : 124,454.25 = 20,640.18 : x
  2. Step 2: Convert to fraction form
    82,969.68/124,454.25 = 20,640.18/x
  3. Step 3: Cross multiply
    82,969.68x = 124,454.25 × 20,640.18
  4. Step 4: Simplify right side
    82,969.68x = 2,568,758,121.77
  5. Step 5: Solve for x
    x = 2,568,758,121.77/82,969.68
  6. Step 6: Final answer
    x = 30,960.20

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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.