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Finding the Fourth Proportional to 39, 54 and 35.52

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Solution

The fourth proportional to 39, 54 and 35.52 is: 49.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    39 : 54 = 35.52 : x
  2. Step 2: Convert to fraction form
    39/54 = 35.52/x
  3. Step 3: Cross multiply
    39x = 54 × 35.52
  4. Step 4: Simplify right side
    39x = 1,918.08
  5. Step 5: Solve for x
    x = 1,918.08/39
  6. Step 6: Final answer
    x = 49.18

Related Problems

Find fourth proportional to 19.50, 27 and 17.76
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Double scale
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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.