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Finding the Fourth Proportional to 203,988.96, 305,878.08 and 91,572.72

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Solution

The fourth proportional to 203,988.96, 305,878.08 and 91,572.72 is: 137,311.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,988.96 : 305,878.08 = 91,572.72 : x
  2. Step 2: Convert to fraction form
    203,988.96/305,878.08 = 91,572.72/x
  3. Step 3: Cross multiply
    203,988.96x = 305,878.08 × 91,572.72
  4. Step 4: Simplify right side
    203,988.96x = 28,010,087,773.98
  5. Step 5: Solve for x
    x = 28,010,087,773.98/203,988.96
  6. Step 6: Final answer
    x = 137,311.78

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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.