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Finding the Fourth Proportional to 26.19, 39.43 and 20.51

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Solution

The fourth proportional to 26.19, 39.43 and 20.51 is: 30.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.19 : 39.43 = 20.51 : x
  2. Step 2: Convert to fraction form
    26.19/39.43 = 20.51/x
  3. Step 3: Cross multiply
    26.19x = 39.43 × 20.51
  4. Step 4: Simplify right side
    26.19x = 808.71
  5. Step 5: Solve for x
    x = 808.71/26.19
  6. Step 6: Final answer
    x = 30.88

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.