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Finding the Fourth Proportional to 30.98, 46.47 and 13.86

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Solution

The fourth proportional to 30.98, 46.47 and 13.86 is: 20.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.98 : 46.47 = 13.86 : x
  2. Step 2: Convert to fraction form
    30.98/46.47 = 13.86/x
  3. Step 3: Cross multiply
    30.98x = 46.47 × 13.86
  4. Step 4: Simplify right side
    30.98x = 643.84
  5. Step 5: Solve for x
    x = 643.84/30.98
  6. Step 6: Final answer
    x = 20.78

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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.