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Finding the Fourth Proportional to 80,511.20, 120,718.80 and 49,368.80

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Solution

The fourth proportional to 80,511.20, 120,718.80 and 49,368.80 is: 74,023.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,511.20 : 120,718.80 = 49,368.80 : x
  2. Step 2: Convert to fraction form
    80,511.20/120,718.80 = 49,368.80/x
  3. Step 3: Cross multiply
    80,511.20x = 120,718.80 × 49,368.80
  4. Step 4: Simplify right side
    80,511.20x = 5,959,742,293.44
  5. Step 5: Solve for x
    x = 5,959,742,293.44/80,511.20
  6. Step 6: Final answer
    x = 74,023.77

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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.