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Finding the Fourth Proportional to 65, 96.85 and 64.36

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Solution

The fourth proportional to 65, 96.85 and 64.36 is: 95.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    65 : 96.85 = 64.36 : x
  2. Step 2: Convert to fraction form
    65/96.85 = 64.36/x
  3. Step 3: Cross multiply
    65x = 96.85 × 64.36
  4. Step 4: Simplify right side
    65x = 6,233.27
  5. Step 5: Solve for x
    x = 6,233.27/65
  6. Step 6: Final answer
    x = 95.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.