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Finding the Fourth Proportional to 99,381.60, 149,072.40 and 80,719.20

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Solution

The fourth proportional to 99,381.60, 149,072.40 and 80,719.20 is: 121,078.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,381.60 : 149,072.40 = 80,719.20 : x
  2. Step 2: Convert to fraction form
    99,381.60/149,072.40 = 80,719.20/x
  3. Step 3: Cross multiply
    99,381.60x = 149,072.40 × 80,719.20
  4. Step 4: Simplify right side
    99,381.60x = 12,033,004,870.08
  5. Step 5: Solve for x
    x = 12,033,004,870.08/99,381.60
  6. Step 6: Final answer
    x = 121,078.80

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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.