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Finding the Fourth Proportional to 28.77, 39.70 and 18.92

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Solution

The fourth proportional to 28.77, 39.70 and 18.92 is: 26.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.77 : 39.70 = 18.92 : x
  2. Step 2: Convert to fraction form
    28.77/39.70 = 18.92/x
  3. Step 3: Cross multiply
    28.77x = 39.70 × 18.92
  4. Step 4: Simplify right side
    28.77x = 751.12
  5. Step 5: Solve for x
    x = 751.12/28.77
  6. Step 6: Final answer
    x = 26.11

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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.