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Finding the Fourth Proportional to 30.65, 46.21 and 28.79

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Solution

The fourth proportional to 30.65, 46.21 and 28.79 is: 43.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.65 : 46.21 = 28.79 : x
  2. Step 2: Convert to fraction form
    30.65/46.21 = 28.79/x
  3. Step 3: Cross multiply
    30.65x = 46.21 × 28.79
  4. Step 4: Simplify right side
    30.65x = 1,330.43
  5. Step 5: Solve for x
    x = 1,330.43/30.65
  6. Step 6: Final answer
    x = 43.41

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.