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Finding the Fourth Proportional to 64.57, 96.84 and 42.66

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Solution

The fourth proportional to 64.57, 96.84 and 42.66 is: 63.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.57 : 96.84 = 42.66 : x
  2. Step 2: Convert to fraction form
    64.57/96.84 = 42.66/x
  3. Step 3: Cross multiply
    64.57x = 96.84 × 42.66
  4. Step 4: Simplify right side
    64.57x = 4,131.13
  5. Step 5: Solve for x
    x = 4,131.13/64.57
  6. Step 6: Final answer
    x = 63.98

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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.