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Finding the Fourth Proportional to 64.64, 96.84 and 34.20

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Solution

The fourth proportional to 64.64, 96.84 and 34.20 is: 51.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.64 : 96.84 = 34.20 : x
  2. Step 2: Convert to fraction form
    64.64/96.84 = 34.20/x
  3. Step 3: Cross multiply
    64.64x = 96.84 × 34.20
  4. Step 4: Simplify right side
    64.64x = 3,311.93
  5. Step 5: Solve for x
    x = 3,311.93/64.64
  6. Step 6: Final answer
    x = 51.23

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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.