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Finding the Fourth Proportional to 87,768.80, 131,458.80 and 72,216.80

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Solution

The fourth proportional to 87,768.80, 131,458.80 and 72,216.80 is: 108,165.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,768.80 : 131,458.80 = 72,216.80 : x
  2. Step 2: Convert to fraction form
    87,768.80/131,458.80 = 72,216.80/x
  3. Step 3: Cross multiply
    87,768.80x = 131,458.80 × 72,216.80
  4. Step 4: Simplify right side
    87,768.80x = 9,493,533,867.84
  5. Step 5: Solve for x
    x = 9,493,533,867.84/87,768.80
  6. Step 6: Final answer
    x = 108,165.25

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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.