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Finding the Fourth Proportional to 68.69, 102.85 and 39.76

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Solution

The fourth proportional to 68.69, 102.85 and 39.76 is: 59.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.69 : 102.85 = 39.76 : x
  2. Step 2: Convert to fraction form
    68.69/102.85 = 39.76/x
  3. Step 3: Cross multiply
    68.69x = 102.85 × 39.76
  4. Step 4: Simplify right side
    68.69x = 4,088.96
  5. Step 5: Solve for x
    x = 4,088.96/68.69
  6. Step 6: Final answer
    x = 59.53

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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.