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Finding the Fourth Proportional to 28.90, 39.87 and 19.18

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Solution

The fourth proportional to 28.90, 39.87 and 19.18 is: 26.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.90 : 39.87 = 19.18 : x
  2. Step 2: Convert to fraction form
    28.90/39.87 = 19.18/x
  3. Step 3: Cross multiply
    28.90x = 39.87 × 19.18
  4. Step 4: Simplify right side
    28.90x = 764.71
  5. Step 5: Solve for x
    x = 764.71/28.90
  6. Step 6: Final answer
    x = 26.46

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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.