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Finding the Fourth Proportional to 68.25, 102.39 and 47.76

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Solution

The fourth proportional to 68.25, 102.39 and 47.76 is: 71.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.25 : 102.39 = 47.76 : x
  2. Step 2: Convert to fraction form
    68.25/102.39 = 47.76/x
  3. Step 3: Cross multiply
    68.25x = 102.39 × 47.76
  4. Step 4: Simplify right side
    68.25x = 4,889.58
  5. Step 5: Solve for x
    x = 4,889.58/68.25
  6. Step 6: Final answer
    x = 71.64

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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.