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Finding the Fourth Proportional to 91,212.80, 136,588.80 and 72,780.80

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Solution

The fourth proportional to 91,212.80, 136,588.80 and 72,780.80 is: 108,987.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,212.80 : 136,588.80 = 72,780.80 : x
  2. Step 2: Convert to fraction form
    91,212.80/136,588.80 = 72,780.80/x
  3. Step 3: Cross multiply
    91,212.80x = 136,588.80 × 72,780.80
  4. Step 4: Simplify right side
    91,212.80x = 9,941,042,135.04
  5. Step 5: Solve for x
    x = 9,941,042,135.04/91,212.80
  6. Step 6: Final answer
    x = 108,987.36

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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.