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Finding the Fourth Proportional to 68,811.71, 103,212.55 and 30,872.72

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Solution

The fourth proportional to 68,811.71, 103,212.55 and 30,872.72 is: 46,306.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,811.71 : 103,212.55 = 30,872.72 : x
  2. Step 2: Convert to fraction form
    68,811.71/103,212.55 = 30,872.72/x
  3. Step 3: Cross multiply
    68,811.71x = 103,212.55 × 30,872.72
  4. Step 4: Simplify right side
    68,811.71x = 3,186,452,531.01
  5. Step 5: Solve for x
    x = 3,186,452,531.01/68,811.71
  6. Step 6: Final answer
    x = 46,306.84

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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.