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Finding the Fourth Proportional to 30.77, 42.43 and 23.85

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Solution

The fourth proportional to 30.77, 42.43 and 23.85 is: 32.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.77 : 42.43 = 23.85 : x
  2. Step 2: Convert to fraction form
    30.77/42.43 = 23.85/x
  3. Step 3: Cross multiply
    30.77x = 42.43 × 23.85
  4. Step 4: Simplify right side
    30.77x = 1,011.62
  5. Step 5: Solve for x
    x = 1,011.62/30.77
  6. Step 6: Final answer
    x = 32.88

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Find fourth proportional to 15.38, 21.21 and 11.92
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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.