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Finding the Fourth Proportional to 91,205.20, 136,548.60 and 80,837.20

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Solution

The fourth proportional to 91,205.20, 136,548.60 and 80,837.20 is: 121,026.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,205.20 : 136,548.60 = 80,837.20 : x
  2. Step 2: Convert to fraction form
    91,205.20/136,548.60 = 80,837.20/x
  3. Step 3: Cross multiply
    91,205.20x = 136,548.60 × 80,837.20
  4. Step 4: Simplify right side
    91,205.20x = 11,038,206,487.92
  5. Step 5: Solve for x
    x = 11,038,206,487.92/91,205.20
  6. Step 6: Final answer
    x = 121,026.07

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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.