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Finding the Fourth Proportional to 21, 28.92 and 17.36

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Solution

The fourth proportional to 21, 28.92 and 17.36 is: 23.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21 : 28.92 = 17.36 : x
  2. Step 2: Convert to fraction form
    21/28.92 = 17.36/x
  3. Step 3: Cross multiply
    21x = 28.92 × 17.36
  4. Step 4: Simplify right side
    21x = 502.05
  5. Step 5: Solve for x
    x = 502.05/21
  6. Step 6: Final answer
    x = 23.91

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1.5x scale

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.