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Finding the Fourth Proportional to 28.94, 39.98 and 19.77

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Solution

The fourth proportional to 28.94, 39.98 and 19.77 is: 27.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.94 : 39.98 = 19.77 : x
  2. Step 2: Convert to fraction form
    28.94/39.98 = 19.77/x
  3. Step 3: Cross multiply
    28.94x = 39.98 × 19.77
  4. Step 4: Simplify right side
    28.94x = 790.31
  5. Step 5: Solve for x
    x = 790.31/28.94
  6. Step 6: Final answer
    x = 27.31

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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.