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Finding the Fourth Proportional to 21.16, 29.26 and 19.29

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Solution

The fourth proportional to 21.16, 29.26 and 19.29 is: 26.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.16 : 29.26 = 19.29 : x
  2. Step 2: Convert to fraction form
    21.16/29.26 = 19.29/x
  3. Step 3: Cross multiply
    21.16x = 29.26 × 19.29
  4. Step 4: Simplify right side
    21.16x = 564.39
  5. Step 5: Solve for x
    x = 564.39/21.16
  6. Step 6: Final answer
    x = 26.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.