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Finding the Fourth Proportional to 90,608.10, 135,912.15 and 86,234.10

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Solution

The fourth proportional to 90,608.10, 135,912.15 and 86,234.10 is: 129,351.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,608.10 : 135,912.15 = 86,234.10 : x
  2. Step 2: Convert to fraction form
    90,608.10/135,912.15 = 86,234.10/x
  3. Step 3: Cross multiply
    90,608.10x = 135,912.15 × 86,234.10
  4. Step 4: Simplify right side
    90,608.10x = 11,720,261,934.32
  5. Step 5: Solve for x
    x = 11,720,261,934.32/90,608.10
  6. Step 6: Final answer
    x = 129,351.15

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1.5x scale

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.