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Finding the Fourth Proportional to 30.95, 46.47 and 21.96

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Solution

The fourth proportional to 30.95, 46.47 and 21.96 is: 32.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.95 : 46.47 = 21.96 : x
  2. Step 2: Convert to fraction form
    30.95/46.47 = 21.96/x
  3. Step 3: Cross multiply
    30.95x = 46.47 × 21.96
  4. Step 4: Simplify right side
    30.95x = 1,020.48
  5. Step 5: Solve for x
    x = 1,020.48/30.95
  6. Step 6: Final answer
    x = 32.98

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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.