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Finding the Fourth Proportional to 80,661.87, 120,826.35 and 47,280.57

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Solution

The fourth proportional to 80,661.87, 120,826.35 and 47,280.57 is: 70,823.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,661.87 : 120,826.35 = 47,280.57 : x
  2. Step 2: Convert to fraction form
    80,661.87/120,826.35 = 47,280.57/x
  3. Step 3: Cross multiply
    80,661.87x = 120,826.35 × 47,280.57
  4. Step 4: Simplify right side
    80,661.87x = 5,712,738,699.02
  5. Step 5: Solve for x
    x = 5,712,738,699.02/80,661.87
  6. Step 6: Final answer
    x = 70,823.29

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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.