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Finding the Fourth Proportional to 91,818.56, 126,713.76 and 71,912

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Solution

The fourth proportional to 91,818.56, 126,713.76 and 71,912 is: 99,241.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,818.56 : 126,713.76 = 71,912 : x
  2. Step 2: Convert to fraction form
    91,818.56/126,713.76 = 71,912/x
  3. Step 3: Cross multiply
    91,818.56x = 126,713.76 × 71,912
  4. Step 4: Simplify right side
    91,818.56x = 9,112,239,909.12
  5. Step 5: Solve for x
    x = 9,112,239,909.12/91,818.56
  6. Step 6: Final answer
    x = 99,241.81

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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.