Home / 81,711.36-122,535.42-31,784.64

Finding the Fourth Proportional to 81,711.36, 122,535.42 and 31,784.64

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Solution

The fourth proportional to 81,711.36, 122,535.42 and 31,784.64 is: 47,664.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,711.36 : 122,535.42 = 31,784.64 : x
  2. Step 2: Convert to fraction form
    81,711.36/122,535.42 = 31,784.64/x
  3. Step 3: Cross multiply
    81,711.36x = 122,535.42 × 31,784.64
  4. Step 4: Simplify right side
    81,711.36x = 3,894,744,211.95
  5. Step 5: Solve for x
    x = 3,894,744,211.95/81,711.36
  6. Step 6: Final answer
    x = 47,664.66

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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.