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Finding the Fourth Proportional to 64.35, 96.42 and 38.65

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Solution

The fourth proportional to 64.35, 96.42 and 38.65 is: 57.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.35 : 96.42 = 38.65 : x
  2. Step 2: Convert to fraction form
    64.35/96.42 = 38.65/x
  3. Step 3: Cross multiply
    64.35x = 96.42 × 38.65
  4. Step 4: Simplify right side
    64.35x = 3,726.63
  5. Step 5: Solve for x
    x = 3,726.63/64.35
  6. Step 6: Final answer
    x = 57.91

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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.