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Finding the Fourth Proportional to 65.35, 97.90 and 39.69

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Solution

The fourth proportional to 65.35, 97.90 and 39.69 is: 59.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.35 : 97.90 = 39.69 : x
  2. Step 2: Convert to fraction form
    65.35/97.90 = 39.69/x
  3. Step 3: Cross multiply
    65.35x = 97.90 × 39.69
  4. Step 4: Simplify right side
    65.35x = 3,885.16
  5. Step 5: Solve for x
    x = 3,885.16/65.35
  6. Step 6: Final answer
    x = 59.45

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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.