Home / 81,213.40-121,815.76-25,805.08

Finding the Fourth Proportional to 81,213.40, 121,815.76 and 25,805.08

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Solution

The fourth proportional to 81,213.40, 121,815.76 and 25,805.08 is: 38,706.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,213.40 : 121,815.76 = 25,805.08 : x
  2. Step 2: Convert to fraction form
    81,213.40/121,815.76 = 25,805.08/x
  3. Step 3: Cross multiply
    81,213.40x = 121,815.76 × 25,805.08
  4. Step 4: Simplify right side
    81,213.40x = 3,143,465,432.06
  5. Step 5: Solve for x
    x = 3,143,465,432.06/81,213.40
  6. Step 6: Final answer
    x = 38,706.24

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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.