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Finding the Fourth Proportional to 39, 53.78 and 27.77

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Solution

The fourth proportional to 39, 53.78 and 27.77 is: 38.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    39 : 53.78 = 27.77 : x
  2. Step 2: Convert to fraction form
    39/53.78 = 27.77/x
  3. Step 3: Cross multiply
    39x = 53.78 × 27.77
  4. Step 4: Simplify right side
    39x = 1,493.06
  5. Step 5: Solve for x
    x = 1,493.06/39
  6. Step 6: Final answer
    x = 38.28

Related Problems

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Similar ratio
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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.