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Finding the Fourth Proportional to 81,407.70, 122,111.55 and 68,285.70

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Solution

The fourth proportional to 81,407.70, 122,111.55 and 68,285.70 is: 102,428.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,407.70 : 122,111.55 = 68,285.70 : x
  2. Step 2: Convert to fraction form
    81,407.70/122,111.55 = 68,285.70/x
  3. Step 3: Cross multiply
    81,407.70x = 122,111.55 × 68,285.70
  4. Step 4: Simplify right side
    81,407.70x = 8,338,472,669.84
  5. Step 5: Solve for x
    x = 8,338,472,669.84/81,407.70
  6. Step 6: Final answer
    x = 102,428.55

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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.