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Finding the Fourth Proportional to 81,391.78, 112,329.93 and 49,579.30

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Solution

The fourth proportional to 81,391.78, 112,329.93 and 49,579.30 is: 68,425.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,391.78 : 112,329.93 = 49,579.30 : x
  2. Step 2: Convert to fraction form
    81,391.78/112,329.93 = 49,579.30/x
  3. Step 3: Cross multiply
    81,391.78x = 112,329.93 × 49,579.30
  4. Step 4: Simplify right side
    81,391.78x = 5,569,239,298.45
  5. Step 5: Solve for x
    x = 5,569,239,298.45/81,391.78
  6. Step 6: Final answer
    x = 68,425.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.