Home / 81,782.40-122,718.72-40,229.76

Finding the Fourth Proportional to 81,782.40, 122,718.72 and 40,229.76

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Solution

The fourth proportional to 81,782.40, 122,718.72 and 40,229.76 is: 60,366.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,782.40 : 122,718.72 = 40,229.76 : x
  2. Step 2: Convert to fraction form
    81,782.40/122,718.72 = 40,229.76/x
  3. Step 3: Cross multiply
    81,782.40x = 122,718.72 × 40,229.76
  4. Step 4: Simplify right side
    81,782.40x = 4,936,944,653.11
  5. Step 5: Solve for x
    x = 4,936,944,653.11/81,782.40
  6. Step 6: Final answer
    x = 60,366.84

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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.