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Finding the Fourth Proportional to 123,860.80, 170,955.18 and 81,423.28

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Solution

The fourth proportional to 123,860.80, 170,955.18 and 81,423.28 is: 112,382.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,860.80 : 170,955.18 = 81,423.28 : x
  2. Step 2: Convert to fraction form
    123,860.80/170,955.18 = 81,423.28/x
  3. Step 3: Cross multiply
    123,860.80x = 170,955.18 × 81,423.28
  4. Step 4: Simplify right side
    123,860.80x = 13,919,731,488.59
  5. Step 5: Solve for x
    x = 13,919,731,488.59/123,860.80
  6. Step 6: Final answer
    x = 112,382.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.