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Finding the Fourth Proportional to 30.75, 46.15 and 21.14

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Solution

The fourth proportional to 30.75, 46.15 and 21.14 is: 31.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.75 : 46.15 = 21.14 : x
  2. Step 2: Convert to fraction form
    30.75/46.15 = 21.14/x
  3. Step 3: Cross multiply
    30.75x = 46.15 × 21.14
  4. Step 4: Simplify right side
    30.75x = 975.38
  5. Step 5: Solve for x
    x = 975.38/30.75
  6. Step 6: Final answer
    x = 31.72

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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.