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Finding the Fourth Proportional to 82,407.80, 123,611.70 and 20,078.30

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Solution

The fourth proportional to 82,407.80, 123,611.70 and 20,078.30 is: 30,117.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,407.80 : 123,611.70 = 20,078.30 : x
  2. Step 2: Convert to fraction form
    82,407.80/123,611.70 = 20,078.30/x
  3. Step 3: Cross multiply
    82,407.80x = 123,611.70 × 20,078.30
  4. Step 4: Simplify right side
    82,407.80x = 2,481,912,796.11
  5. Step 5: Solve for x
    x = 2,481,912,796.11/82,407.80
  6. Step 6: Final answer
    x = 30,117.45

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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.