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Finding the Fourth Proportional to 14.90, 20.30 and 14.81

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Solution

The fourth proportional to 14.90, 20.30 and 14.81 is: 20.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.90 : 20.30 = 14.81 : x
  2. Step 2: Convert to fraction form
    14.90/20.30 = 14.81/x
  3. Step 3: Cross multiply
    14.90x = 20.30 × 14.81
  4. Step 4: Simplify right side
    14.90x = 300.47
  5. Step 5: Solve for x
    x = 300.47/14.90
  6. Step 6: Final answer
    x = 20.17

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.