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Finding the Fourth Proportional to 30.84, 42.45 and 25.98

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Solution

The fourth proportional to 30.84, 42.45 and 25.98 is: 35.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.84 : 42.45 = 25.98 : x
  2. Step 2: Convert to fraction form
    30.84/42.45 = 25.98/x
  3. Step 3: Cross multiply
    30.84x = 42.45 × 25.98
  4. Step 4: Simplify right side
    30.84x = 1,102.85
  5. Step 5: Solve for x
    x = 1,102.85/30.84
  6. Step 6: Final answer
    x = 35.76

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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.