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Finding the Fourth Proportional to 29.21, 43.80 and 13.18

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Solution

The fourth proportional to 29.21, 43.80 and 13.18 is: 19.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.21 : 43.80 = 13.18 : x
  2. Step 2: Convert to fraction form
    29.21/43.80 = 13.18/x
  3. Step 3: Cross multiply
    29.21x = 43.80 × 13.18
  4. Step 4: Simplify right side
    29.21x = 577.28
  5. Step 5: Solve for x
    x = 577.28/29.21
  6. Step 6: Final answer
    x = 19.76

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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.