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Finding the Fourth Proportional to 82,718.80, 124,078.20 and 20,389.30

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Solution

The fourth proportional to 82,718.80, 124,078.20 and 20,389.30 is: 30,583.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,718.80 : 124,078.20 = 20,389.30 : x
  2. Step 2: Convert to fraction form
    82,718.80/124,078.20 = 20,389.30/x
  3. Step 3: Cross multiply
    82,718.80x = 124,078.20 × 20,389.30
  4. Step 4: Simplify right side
    82,718.80x = 2,529,867,643.26
  5. Step 5: Solve for x
    x = 2,529,867,643.26/82,718.80
  6. Step 6: Final answer
    x = 30,583.95

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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.