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Finding the Fourth Proportional to 19.10, 28.72 and 18.77

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Solution

The fourth proportional to 19.10, 28.72 and 18.77 is: 28.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.10 : 28.72 = 18.77 : x
  2. Step 2: Convert to fraction form
    19.10/28.72 = 18.77/x
  3. Step 3: Cross multiply
    19.10x = 28.72 × 18.77
  4. Step 4: Simplify right side
    19.10x = 538.95
  5. Step 5: Solve for x
    x = 538.95/19.10
  6. Step 6: Final answer
    x = 28.21

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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.