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Finding the Fourth Proportional to 81,718.52, 112,776.38 and 61,539.80

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Solution

The fourth proportional to 81,718.52, 112,776.38 and 61,539.80 is: 84,928.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,718.52 : 112,776.38 = 61,539.80 : x
  2. Step 2: Convert to fraction form
    81,718.52/112,776.38 = 61,539.80/x
  3. Step 3: Cross multiply
    81,718.52x = 112,776.38 × 61,539.80
  4. Step 4: Simplify right side
    81,718.52x = 6,940,234,998.34
  5. Step 5: Solve for x
    x = 6,940,234,998.34/81,718.52
  6. Step 6: Final answer
    x = 84,928.55

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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.