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Finding the Fourth Proportional to 80,718.72, 121,047.36 and 36,912

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Solution

The fourth proportional to 80,718.72, 121,047.36 and 36,912 is: 55,353.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,718.72 : 121,047.36 = 36,912 : x
  2. Step 2: Convert to fraction form
    80,718.72/121,047.36 = 36,912/x
  3. Step 3: Cross multiply
    80,718.72x = 121,047.36 × 36,912
  4. Step 4: Simplify right side
    80,718.72x = 4,468,100,152.32
  5. Step 5: Solve for x
    x = 4,468,100,152.32/80,718.72
  6. Step 6: Final answer
    x = 55,353.95

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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.