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Finding the Fourth Proportional to 30.17, 45.26 and 13.92

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Solution

The fourth proportional to 30.17, 45.26 and 13.92 is: 20.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.17 : 45.26 = 13.92 : x
  2. Step 2: Convert to fraction form
    30.17/45.26 = 13.92/x
  3. Step 3: Cross multiply
    30.17x = 45.26 × 13.92
  4. Step 4: Simplify right side
    30.17x = 630.02
  5. Step 5: Solve for x
    x = 630.02/30.17
  6. Step 6: Final answer
    x = 20.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.