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Finding the Fourth Proportional to 29.16, 40.20 and 21

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Solution

The fourth proportional to 29.16, 40.20 and 21 is: 28.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.16 : 40.20 = 21 : x
  2. Step 2: Convert to fraction form
    29.16/40.20 = 21/x
  3. Step 3: Cross multiply
    29.16x = 40.20 × 21
  4. Step 4: Simplify right side
    29.16x = 844.20
  5. Step 5: Solve for x
    x = 844.20/29.16
  6. Step 6: Final answer
    x = 28.95

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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.