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Finding the Fourth Proportional to 65.11, 89.83 and 39.23

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Solution

The fourth proportional to 65.11, 89.83 and 39.23 is: 54.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.11 : 89.83 = 39.23 : x
  2. Step 2: Convert to fraction form
    65.11/89.83 = 39.23/x
  3. Step 3: Cross multiply
    65.11x = 89.83 × 39.23
  4. Step 4: Simplify right side
    65.11x = 3,523.83
  5. Step 5: Solve for x
    x = 3,523.83/65.11
  6. Step 6: Final answer
    x = 54.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.