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Finding the Fourth Proportional to 29.25, 40.26 and 21.87

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Solution

The fourth proportional to 29.25, 40.26 and 21.87 is: 30.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.25 : 40.26 = 21.87 : x
  2. Step 2: Convert to fraction form
    29.25/40.26 = 21.87/x
  3. Step 3: Cross multiply
    29.25x = 40.26 × 21.87
  4. Step 4: Simplify right side
    29.25x = 880.49
  5. Step 5: Solve for x
    x = 880.49/29.25
  6. Step 6: Final answer
    x = 30.10

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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.