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Finding the Fourth Proportional to 91,220.80, 136,600.80 and 72,788.80

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Solution

The fourth proportional to 91,220.80, 136,600.80 and 72,788.80 is: 108,999.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,220.80 : 136,600.80 = 72,788.80 : x
  2. Step 2: Convert to fraction form
    91,220.80/136,600.80 = 72,788.80/x
  3. Step 3: Cross multiply
    91,220.80x = 136,600.80 × 72,788.80
  4. Step 4: Simplify right side
    91,220.80x = 9,943,008,311.04
  5. Step 5: Solve for x
    x = 9,943,008,311.04/91,220.80
  6. Step 6: Final answer
    x = 108,999.35

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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.