Home / 81,711.21-122,535.22-31,784.56

Finding the Fourth Proportional to 81,711.21, 122,535.22 and 31,784.56

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Solution

The fourth proportional to 81,711.21, 122,535.22 and 31,784.56 is: 47,664.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,711.21 : 122,535.22 = 31,784.56 : x
  2. Step 2: Convert to fraction form
    81,711.21/122,535.22 = 31,784.56/x
  3. Step 3: Cross multiply
    81,711.21x = 122,535.22 × 31,784.56
  4. Step 4: Simplify right side
    81,711.21x = 3,894,727,972.74
  5. Step 5: Solve for x
    x = 3,894,727,972.74/81,711.21
  6. Step 6: Final answer
    x = 47,664.55

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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.