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Finding the Fourth Proportional to 30.63, 42.28 and 28.83

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Solution

The fourth proportional to 30.63, 42.28 and 28.83 is: 39.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.63 : 42.28 = 28.83 : x
  2. Step 2: Convert to fraction form
    30.63/42.28 = 28.83/x
  3. Step 3: Cross multiply
    30.63x = 42.28 × 28.83
  4. Step 4: Simplify right side
    30.63x = 1,218.93
  5. Step 5: Solve for x
    x = 1,218.93/30.63
  6. Step 6: Final answer
    x = 39.80

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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.