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Finding the Fourth Proportional to 30.96, 46.40 and 21.95

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Solution

The fourth proportional to 30.96, 46.40 and 21.95 is: 32.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.96 : 46.40 = 21.95 : x
  2. Step 2: Convert to fraction form
    30.96/46.40 = 21.95/x
  3. Step 3: Cross multiply
    30.96x = 46.40 × 21.95
  4. Step 4: Simplify right side
    30.96x = 1,018.14
  5. Step 5: Solve for x
    x = 1,018.14/30.96
  6. Step 6: Final answer
    x = 32.89

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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.