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Finding the Fourth Proportional to 65.09, 97.78 and 39.42

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Solution

The fourth proportional to 65.09, 97.78 and 39.42 is: 59.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.09 : 97.78 = 39.42 : x
  2. Step 2: Convert to fraction form
    65.09/97.78 = 39.42/x
  3. Step 3: Cross multiply
    65.09x = 97.78 × 39.42
  4. Step 4: Simplify right side
    65.09x = 3,854.76
  5. Step 5: Solve for x
    x = 3,854.76/65.09
  6. Step 6: Final answer
    x = 59.22

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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.