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Finding the Fourth Proportional to 30.68, 46.04 and 12.64

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Solution

The fourth proportional to 30.68, 46.04 and 12.64 is: 18.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.68 : 46.04 = 12.64 : x
  2. Step 2: Convert to fraction form
    30.68/46.04 = 12.64/x
  3. Step 3: Cross multiply
    30.68x = 46.04 × 12.64
  4. Step 4: Simplify right side
    30.68x = 582.14
  5. Step 5: Solve for x
    x = 582.14/30.68
  6. Step 6: Final answer
    x = 18.97

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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.