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Finding the Fourth Proportional to 19, 26.22 and 12.55

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Solution

The fourth proportional to 19, 26.22 and 12.55 is: 17.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    19 : 26.22 = 12.55 : x
  2. Step 2: Convert to fraction form
    19/26.22 = 12.55/x
  3. Step 3: Cross multiply
    19x = 26.22 × 12.55
  4. Step 4: Simplify right side
    19x = 329.06
  5. Step 5: Solve for x
    x = 329.06/19
  6. Step 6: Final answer
    x = 17.32

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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.