Home / 81,159.90-121,725.99-21,981.75

Finding the Fourth Proportional to 81,159.90, 121,725.99 and 21,981.75

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Solution

The fourth proportional to 81,159.90, 121,725.99 and 21,981.75 is: 32,968.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,159.90 : 121,725.99 = 21,981.75 : x
  2. Step 2: Convert to fraction form
    81,159.90/121,725.99 = 21,981.75/x
  3. Step 3: Cross multiply
    81,159.90x = 121,725.99 × 21,981.75
  4. Step 4: Simplify right side
    81,159.90x = 2,675,750,280.68
  5. Step 5: Solve for x
    x = 2,675,750,280.68/81,159.90
  6. Step 6: Final answer
    x = 32,968.87

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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.