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Finding the Fourth Proportional to 39, 53.79 and 26.74

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Solution

The fourth proportional to 39, 53.79 and 26.74 is: 36.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    39 : 53.79 = 26.74 : x
  2. Step 2: Convert to fraction form
    39/53.79 = 26.74/x
  3. Step 3: Cross multiply
    39x = 53.79 × 26.74
  4. Step 4: Simplify right side
    39x = 1,438.34
  5. Step 5: Solve for x
    x = 1,438.34/39
  6. Step 6: Final answer
    x = 36.88

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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.