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Finding the Fourth Proportional to 22.55, 31.30 and 21.99

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Solution

The fourth proportional to 22.55, 31.30 and 21.99 is: 30.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.55 : 31.30 = 21.99 : x
  2. Step 2: Convert to fraction form
    22.55/31.30 = 21.99/x
  3. Step 3: Cross multiply
    22.55x = 31.30 × 21.99
  4. Step 4: Simplify right side
    22.55x = 688.47
  5. Step 5: Solve for x
    x = 688.47/22.55
  6. Step 6: Final answer
    x = 30.54

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.