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Finding the Fourth Proportional to 123,117.87, 170,042.79 and 82,761.65

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Solution

The fourth proportional to 123,117.87, 170,042.79 and 82,761.65 is: 114,305.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,117.87 : 170,042.79 = 82,761.65 : x
  2. Step 2: Convert to fraction form
    123,117.87/170,042.79 = 82,761.65/x
  3. Step 3: Cross multiply
    123,117.87x = 170,042.79 × 82,761.65
  4. Step 4: Simplify right side
    123,117.87x = 14,073,021,968.81
  5. Step 5: Solve for x
    x = 14,073,021,968.81/123,117.87
  6. Step 6: Final answer
    x = 114,305.27

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1.5x scale

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.