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Finding the Fourth Proportional to 30.62, 42 and 28.88

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Solution

The fourth proportional to 30.62, 42 and 28.88 is: 39.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.62 : 42 = 28.88 : x
  2. Step 2: Convert to fraction form
    30.62/42 = 28.88/x
  3. Step 3: Cross multiply
    30.62x = 42 × 28.88
  4. Step 4: Simplify right side
    30.62x = 1,212.75
  5. Step 5: Solve for x
    x = 1,212.75/30.62
  6. Step 6: Final answer
    x = 39.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.