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Finding the Fourth Proportional to 65.69, 98.55 and 39.69

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Solution

The fourth proportional to 65.69, 98.55 and 39.69 is: 59.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.69 : 98.55 = 39.69 : x
  2. Step 2: Convert to fraction form
    65.69/98.55 = 39.69/x
  3. Step 3: Cross multiply
    65.69x = 98.55 × 39.69
  4. Step 4: Simplify right side
    65.69x = 3,910.93
  5. Step 5: Solve for x
    x = 3,910.93/65.69
  6. Step 6: Final answer
    x = 59.54

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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.