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Finding the Fourth Proportional to 22.60, 31.35 and 21.67

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Solution

The fourth proportional to 22.60, 31.35 and 21.67 is: 30.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.60 : 31.35 = 21.67 : x
  2. Step 2: Convert to fraction form
    22.60/31.35 = 21.67/x
  3. Step 3: Cross multiply
    22.60x = 31.35 × 21.67
  4. Step 4: Simplify right side
    22.60x = 679.28
  5. Step 5: Solve for x
    x = 679.28/22.60
  6. Step 6: Final answer
    x = 30.05

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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.