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Finding the Fourth Proportional to 68,678.39, 103,016.50 and 28,718.80

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Solution

The fourth proportional to 68,678.39, 103,016.50 and 28,718.80 is: 43,077.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,678.39 : 103,016.50 = 28,718.80 : x
  2. Step 2: Convert to fraction form
    68,678.39/103,016.50 = 28,718.80/x
  3. Step 3: Cross multiply
    68,678.39x = 103,016.50 × 28,718.80
  4. Step 4: Simplify right side
    68,678.39x = 2,958,510,260.20
  5. Step 5: Solve for x
    x = 2,958,510,260.20/68,678.39
  6. Step 6: Final answer
    x = 43,077.75

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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.