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Finding the Fourth Proportional to 28.94, 39.93 and 21.65

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Solution

The fourth proportional to 28.94, 39.93 and 21.65 is: 29.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.94 : 39.93 = 21.65 : x
  2. Step 2: Convert to fraction form
    28.94/39.93 = 21.65/x
  3. Step 3: Cross multiply
    28.94x = 39.93 × 21.65
  4. Step 4: Simplify right side
    28.94x = 864.20
  5. Step 5: Solve for x
    x = 864.20/28.94
  6. Step 6: Final answer
    x = 29.87

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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.