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Finding the Fourth Proportional to 19, 26.17 and 15.55

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Solution

The fourth proportional to 19, 26.17 and 15.55 is: 21.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    19 : 26.17 = 15.55 : x
  2. Step 2: Convert to fraction form
    19/26.17 = 15.55/x
  3. Step 3: Cross multiply
    19x = 26.17 × 15.55
  4. Step 4: Simplify right side
    19x = 406.94
  5. Step 5: Solve for x
    x = 406.94/19
  6. Step 6: Final answer
    x = 21.42

Related Problems

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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.