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Finding the Fourth Proportional to 26.76, 36.88 and 21.28

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Solution

The fourth proportional to 26.76, 36.88 and 21.28 is: 29.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.76 : 36.88 = 21.28 : x
  2. Step 2: Convert to fraction form
    26.76/36.88 = 21.28/x
  3. Step 3: Cross multiply
    26.76x = 36.88 × 21.28
  4. Step 4: Simplify right side
    26.76x = 784.81
  5. Step 5: Solve for x
    x = 784.81/26.76
  6. Step 6: Final answer
    x = 29.33

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Find fourth proportional to 13.38, 18.44 and 10.64
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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.