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Finding the Fourth Proportional to 64.64, 96.96 and 21.30

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Solution

The fourth proportional to 64.64, 96.96 and 21.30 is: 31.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.64 : 96.96 = 21.30 : x
  2. Step 2: Convert to fraction form
    64.64/96.96 = 21.30/x
  3. Step 3: Cross multiply
    64.64x = 96.96 × 21.30
  4. Step 4: Simplify right side
    64.64x = 2,065.46
  5. Step 5: Solve for x
    x = 2,065.46/64.64
  6. Step 6: Final answer
    x = 31.96

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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.