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Finding the Fourth Proportional to 64.30, 96.46 and 18.64

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Solution

The fourth proportional to 64.30, 96.46 and 18.64 is: 27.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.30 : 96.46 = 18.64 : x
  2. Step 2: Convert to fraction form
    64.30/96.46 = 18.64/x
  3. Step 3: Cross multiply
    64.30x = 96.46 × 18.64
  4. Step 4: Simplify right side
    64.30x = 1,798.21
  5. Step 5: Solve for x
    x = 1,798.21/64.30
  6. Step 6: Final answer
    x = 27.97

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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.