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Finding the Fourth Proportional to 68.76, 102.78 and 62.64

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Solution

The fourth proportional to 68.76, 102.78 and 62.64 is: 93.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.76 : 102.78 = 62.64 : x
  2. Step 2: Convert to fraction form
    68.76/102.78 = 62.64/x
  3. Step 3: Cross multiply
    68.76x = 102.78 × 62.64
  4. Step 4: Simplify right side
    68.76x = 6,438.14
  5. Step 5: Solve for x
    x = 6,438.14/68.76
  6. Step 6: Final answer
    x = 93.63

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.