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Finding the Fourth Proportional to 81,987.80, 123,039.30 and 35,274.20

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Solution

The fourth proportional to 81,987.80, 123,039.30 and 35,274.20 is: 52,936.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,987.80 : 123,039.30 = 35,274.20 : x
  2. Step 2: Convert to fraction form
    81,987.80/123,039.30 = 35,274.20/x
  3. Step 3: Cross multiply
    81,987.80x = 123,039.30 × 35,274.20
  4. Step 4: Simplify right side
    81,987.80x = 4,340,112,876.06
  5. Step 5: Solve for x
    x = 4,340,112,876.06/81,987.80
  6. Step 6: Final answer
    x = 52,936.08

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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.