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Finding the Fourth Proportional to 81,561.42, 112,489.83 and 67,389.66

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Solution

The fourth proportional to 81,561.42, 112,489.83 and 67,389.66 is: 92,944.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,561.42 : 112,489.83 = 67,389.66 : x
  2. Step 2: Convert to fraction form
    81,561.42/112,489.83 = 67,389.66/x
  3. Step 3: Cross multiply
    81,561.42x = 112,489.83 × 67,389.66
  4. Step 4: Simplify right side
    81,561.42x = 7,580,651,397.16
  5. Step 5: Solve for x
    x = 7,580,651,397.16/81,561.42
  6. Step 6: Final answer
    x = 92,944.08

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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.