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Finding the Fourth Proportional to 39, 58.53 and 20.97

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Solution

The fourth proportional to 39, 58.53 and 20.97 is: 31.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    39 : 58.53 = 20.97 : x
  2. Step 2: Convert to fraction form
    39/58.53 = 20.97/x
  3. Step 3: Cross multiply
    39x = 58.53 × 20.97
  4. Step 4: Simplify right side
    39x = 1,227.37
  5. Step 5: Solve for x
    x = 1,227.37/39
  6. Step 6: Final answer
    x = 31.47

Related Problems

Find fourth proportional to 19.50, 29.27 and 10.49
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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.