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Finding the Fourth Proportional to 81,318.40, 121,880.40 and 41,855.20

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Solution

The fourth proportional to 81,318.40, 121,880.40 and 41,855.20 is: 62,732.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,318.40 : 121,880.40 = 41,855.20 : x
  2. Step 2: Convert to fraction form
    81,318.40/121,880.40 = 41,855.20/x
  3. Step 3: Cross multiply
    81,318.40x = 121,880.40 × 41,855.20
  4. Step 4: Simplify right side
    81,318.40x = 5,101,328,518.08
  5. Step 5: Solve for x
    x = 5,101,328,518.08/81,318.40
  6. Step 6: Final answer
    x = 62,732.77

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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.