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Finding the Fourth Proportional to 29.69, 40.97 and 20

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Solution

The fourth proportional to 29.69, 40.97 and 20 is: 27.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.69 : 40.97 = 20 : x
  2. Step 2: Convert to fraction form
    29.69/40.97 = 20/x
  3. Step 3: Cross multiply
    29.69x = 40.97 × 20
  4. Step 4: Simplify right side
    29.69x = 819.40
  5. Step 5: Solve for x
    x = 819.40/29.69
  6. Step 6: Final answer
    x = 27.60

Related Problems

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Double scale
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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.