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Finding the Fourth Proportional to 139,867.84, 209,613.96 and 68,681.80

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Solution

The fourth proportional to 139,867.84, 209,613.96 and 68,681.80 is: 102,930.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,867.84 : 209,613.96 = 68,681.80 : x
  2. Step 2: Convert to fraction form
    139,867.84/209,613.96 = 68,681.80/x
  3. Step 3: Cross multiply
    139,867.84x = 209,613.96 × 68,681.80
  4. Step 4: Simplify right side
    139,867.84x = 14,396,664,077.93
  5. Step 5: Solve for x
    x = 14,396,664,077.93/139,867.84
  6. Step 6: Final answer
    x = 102,930.48

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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.