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Finding the Fourth Proportional to 81,805.76, 112,864.81 and 66,672.42

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Solution

The fourth proportional to 81,805.76, 112,864.81 and 66,672.42 is: 91,985.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,805.76 : 112,864.81 = 66,672.42 : x
  2. Step 2: Convert to fraction form
    81,805.76/112,864.81 = 66,672.42/x
  3. Step 3: Cross multiply
    81,805.76x = 112,864.81 × 66,672.42
  4. Step 4: Simplify right side
    81,805.76x = 7,524,969,550.63
  5. Step 5: Solve for x
    x = 7,524,969,550.63/81,805.76
  6. Step 6: Final answer
    x = 91,985.81

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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.