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Finding the Fourth Proportional to 18.02, 26.93 and 13.21

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Solution

The fourth proportional to 18.02, 26.93 and 13.21 is: 19.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.02 : 26.93 = 13.21 : x
  2. Step 2: Convert to fraction form
    18.02/26.93 = 13.21/x
  3. Step 3: Cross multiply
    18.02x = 26.93 × 13.21
  4. Step 4: Simplify right side
    18.02x = 355.71
  5. Step 5: Solve for x
    x = 355.71/18.02
  6. Step 6: Final answer
    x = 19.74

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.