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Finding the Fourth Proportional to 81,279.72, 112,104 and 69,967.80

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Solution

The fourth proportional to 81,279.72, 112,104 and 69,967.80 is: 96,502.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,279.72 : 112,104 = 69,967.80 : x
  2. Step 2: Convert to fraction form
    81,279.72/112,104 = 69,967.80/x
  3. Step 3: Cross multiply
    81,279.72x = 112,104 × 69,967.80
  4. Step 4: Simplify right side
    81,279.72x = 7,843,670,251.20
  5. Step 5: Solve for x
    x = 7,843,670,251.20/81,279.72
  6. Step 6: Final answer
    x = 96,502.18

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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.