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Finding the Fourth Proportional to 90,912.78, 136,370.34 and 51,473.88

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Solution

The fourth proportional to 90,912.78, 136,370.34 and 51,473.88 is: 77,211.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,912.78 : 136,370.34 = 51,473.88 : x
  2. Step 2: Convert to fraction form
    90,912.78/136,370.34 = 51,473.88/x
  3. Step 3: Cross multiply
    90,912.78x = 136,370.34 × 51,473.88
  4. Step 4: Simplify right side
    90,912.78x = 7,019,510,516.72
  5. Step 5: Solve for x
    x = 7,019,510,516.72/90,912.78
  6. Step 6: Final answer
    x = 77,211.48

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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.