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Finding the Fourth Proportional to 26.47, 36.51 and 21

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Solution

The fourth proportional to 26.47, 36.51 and 21 is: 28.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.47 : 36.51 = 21 : x
  2. Step 2: Convert to fraction form
    26.47/36.51 = 21/x
  3. Step 3: Cross multiply
    26.47x = 36.51 × 21
  4. Step 4: Simplify right side
    26.47x = 766.71
  5. Step 5: Solve for x
    x = 766.71/26.47
  6. Step 6: Final answer
    x = 28.97

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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.