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Finding the Fourth Proportional to 19.21, 26.51 and 11.02

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Solution

The fourth proportional to 19.21, 26.51 and 11.02 is: 15.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.21 : 26.51 = 11.02 : x
  2. Step 2: Convert to fraction form
    19.21/26.51 = 11.02/x
  3. Step 3: Cross multiply
    19.21x = 26.51 × 11.02
  4. Step 4: Simplify right side
    19.21x = 292.14
  5. Step 5: Solve for x
    x = 292.14/19.21
  6. Step 6: Final answer
    x = 15.21

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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.