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Finding the Fourth Proportional to 72,991.40, 109,612.17 and 45,076.64

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Solution

The fourth proportional to 72,991.40, 109,612.17 and 45,076.64 is: 67,692.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,991.40 : 109,612.17 = 45,076.64 : x
  2. Step 2: Convert to fraction form
    72,991.40/109,612.17 = 45,076.64/x
  3. Step 3: Cross multiply
    72,991.40x = 109,612.17 × 45,076.64
  4. Step 4: Simplify right side
    72,991.40x = 4,940,947,778.65
  5. Step 5: Solve for x
    x = 4,940,947,778.65/72,991.40
  6. Step 6: Final answer
    x = 67,692.20

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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.