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Finding the Fourth Proportional to 19, 28.46 and 18.78

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Solution

The fourth proportional to 19, 28.46 and 18.78 is: 28.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    19 : 28.46 = 18.78 : x
  2. Step 2: Convert to fraction form
    19/28.46 = 18.78/x
  3. Step 3: Cross multiply
    19x = 28.46 × 18.78
  4. Step 4: Simplify right side
    19x = 534.48
  5. Step 5: Solve for x
    x = 534.48/19
  6. Step 6: Final answer
    x = 28.13

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1.5x scale

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.