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Finding the Fourth Proportional to 30.96, 43.02 and 30.65

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Solution

The fourth proportional to 30.96, 43.02 and 30.65 is: 42.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.96 : 43.02 = 30.65 : x
  2. Step 2: Convert to fraction form
    30.96/43.02 = 30.65/x
  3. Step 3: Cross multiply
    30.96x = 43.02 × 30.65
  4. Step 4: Simplify right side
    30.96x = 1,318.35
  5. Step 5: Solve for x
    x = 1,318.35/30.96
  6. Step 6: Final answer
    x = 42.58

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.