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Finding the Fourth Proportional to 18.90, 26 and 16.17

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Solution

The fourth proportional to 18.90, 26 and 16.17 is: 22.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.90 : 26 = 16.17 : x
  2. Step 2: Convert to fraction form
    18.90/26 = 16.17/x
  3. Step 3: Cross multiply
    18.90x = 26 × 16.17
  4. Step 4: Simplify right side
    18.90x = 420.42
  5. Step 5: Solve for x
    x = 420.42/18.90
  6. Step 6: Final answer
    x = 22.24

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1.5x scale

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.