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Finding the Fourth Proportional to 19.44, 29 and 18.90

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Solution

The fourth proportional to 19.44, 29 and 18.90 is: 28.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.44 : 29 = 18.90 : x
  2. Step 2: Convert to fraction form
    19.44/29 = 18.90/x
  3. Step 3: Cross multiply
    19.44x = 29 × 18.90
  4. Step 4: Simplify right side
    19.44x = 548.10
  5. Step 5: Solve for x
    x = 548.10/19.44
  6. Step 6: Final answer
    x = 28.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.