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Finding the Fourth Proportional to 65.39, 98.07 and 19.75

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Solution

The fourth proportional to 65.39, 98.07 and 19.75 is: 29.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.39 : 98.07 = 19.75 : x
  2. Step 2: Convert to fraction form
    65.39/98.07 = 19.75/x
  3. Step 3: Cross multiply
    65.39x = 98.07 × 19.75
  4. Step 4: Simplify right side
    65.39x = 1,936.83
  5. Step 5: Solve for x
    x = 1,936.83/65.39
  6. Step 6: Final answer
    x = 29.62

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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.