Home / 81,439.50-122,129.22-28,117.86

Finding the Fourth Proportional to 81,439.50, 122,129.22 and 28,117.86

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Solution

The fourth proportional to 81,439.50, 122,129.22 and 28,117.86 is: 42,166.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,439.50 : 122,129.22 = 28,117.86 : x
  2. Step 2: Convert to fraction form
    81,439.50/122,129.22 = 28,117.86/x
  3. Step 3: Cross multiply
    81,439.50x = 122,129.22 × 28,117.86
  4. Step 4: Simplify right side
    81,439.50x = 3,434,012,142.65
  5. Step 5: Solve for x
    x = 3,434,012,142.65/81,439.50
  6. Step 6: Final answer
    x = 42,166.42

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1.5x scale

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.