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Finding the Fourth Proportional to 82,716.80, 124,075.20 and 20,387.30

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Solution

The fourth proportional to 82,716.80, 124,075.20 and 20,387.30 is: 30,580.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,716.80 : 124,075.20 = 20,387.30 : x
  2. Step 2: Convert to fraction form
    82,716.80/124,075.20 = 20,387.30/x
  3. Step 3: Cross multiply
    82,716.80x = 124,075.20 × 20,387.30
  4. Step 4: Simplify right side
    82,716.80x = 2,529,558,324.96
  5. Step 5: Solve for x
    x = 2,529,558,324.96/82,716.80
  6. Step 6: Final answer
    x = 30,580.95

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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.