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Finding the Fourth Proportional to 81,243.71, 121,325.72 and 80,364.05

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Solution

The fourth proportional to 81,243.71, 121,325.72 and 80,364.05 is: 120,012.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,243.71 : 121,325.72 = 80,364.05 : x
  2. Step 2: Convert to fraction form
    81,243.71/121,325.72 = 80,364.05/x
  3. Step 3: Cross multiply
    81,243.71x = 121,325.72 × 80,364.05
  4. Step 4: Simplify right side
    81,243.71x = 9,750,226,352.96
  5. Step 5: Solve for x
    x = 9,750,226,352.96/81,243.71
  6. Step 6: Final answer
    x = 120,012.08

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.