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Finding the Fourth Proportional to 86,713.80, 130,070.70 and 82,121.10

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Solution

The fourth proportional to 86,713.80, 130,070.70 and 82,121.10 is: 123,181.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,713.80 : 130,070.70 = 82,121.10 : x
  2. Step 2: Convert to fraction form
    86,713.80/130,070.70 = 82,121.10/x
  3. Step 3: Cross multiply
    86,713.80x = 130,070.70 × 82,121.10
  4. Step 4: Simplify right side
    86,713.80x = 10,681,548,961.77
  5. Step 5: Solve for x
    x = 10,681,548,961.77/86,713.80
  6. Step 6: Final answer
    x = 123,181.65

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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.