Home / 81,217.23-121,816.53-21,251.50

Finding the Fourth Proportional to 81,217.23, 121,816.53 and 21,251.50

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Solution

The fourth proportional to 81,217.23, 121,816.53 and 21,251.50 is: 31,874.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,217.23 : 121,816.53 = 21,251.50 : x
  2. Step 2: Convert to fraction form
    81,217.23/121,816.53 = 21,251.50/x
  3. Step 3: Cross multiply
    81,217.23x = 121,816.53 × 21,251.50
  4. Step 4: Simplify right side
    81,217.23x = 2,588,783,271.95
  5. Step 5: Solve for x
    x = 2,588,783,271.95/81,217.23
  6. Step 6: Final answer
    x = 31,874.81

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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.