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Finding the Fourth Proportional to 21.75, 32.60 and 9.70

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Solution

The fourth proportional to 21.75, 32.60 and 9.70 is: 14.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.75 : 32.60 = 9.70 : x
  2. Step 2: Convert to fraction form
    21.75/32.60 = 9.70/x
  3. Step 3: Cross multiply
    21.75x = 32.60 × 9.70
  4. Step 4: Simplify right side
    21.75x = 316.35
  5. Step 5: Solve for x
    x = 316.35/21.75
  6. Step 6: Final answer
    x = 14.54

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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.