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Finding the Fourth Proportional to 103.86, 155.66 and 65.25

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Solution

The fourth proportional to 103.86, 155.66 and 65.25 is: 97.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.86 : 155.66 = 65.25 : x
  2. Step 2: Convert to fraction form
    103.86/155.66 = 65.25/x
  3. Step 3: Cross multiply
    103.86x = 155.66 × 65.25
  4. Step 4: Simplify right side
    103.86x = 10,156.49
  5. Step 5: Solve for x
    x = 10,156.49/103.86
  6. Step 6: Final answer
    x = 97.79

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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.