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Finding the Fourth Proportional to 68,716.40, 103,074.60 and 47,721.20

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Solution

The fourth proportional to 68,716.40, 103,074.60 and 47,721.20 is: 71,581.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,716.40 : 103,074.60 = 47,721.20 : x
  2. Step 2: Convert to fraction form
    68,716.40/103,074.60 = 47,721.20/x
  3. Step 3: Cross multiply
    68,716.40x = 103,074.60 × 47,721.20
  4. Step 4: Simplify right side
    68,716.40x = 4,918,843,601.52
  5. Step 5: Solve for x
    x = 4,918,843,601.52/68,716.40
  6. Step 6: Final answer
    x = 71,581.80

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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.