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Finding the Fourth Proportional to 91,205.72, 136,600.80 and 74,540.84

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Solution

The fourth proportional to 91,205.72, 136,600.80 and 74,540.84 is: 111,641.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,205.72 : 136,600.80 = 74,540.84 : x
  2. Step 2: Convert to fraction form
    91,205.72/136,600.80 = 74,540.84/x
  3. Step 3: Cross multiply
    91,205.72x = 136,600.80 × 74,540.84
  4. Step 4: Simplify right side
    91,205.72x = 10,182,338,376.67
  5. Step 5: Solve for x
    x = 10,182,338,376.67/91,205.72
  6. Step 6: Final answer
    x = 111,641.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.