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Finding the Fourth Proportional to 3.63, 5 and 3.18

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Solution

The fourth proportional to 3.63, 5 and 3.18 is: 4.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.63 : 5 = 3.18 : x
  2. Step 2: Convert to fraction form
    3.63/5 = 3.18/x
  3. Step 3: Cross multiply
    3.63x = 5 × 3.18
  4. Step 4: Simplify right side
    3.63x = 15.90
  5. Step 5: Solve for x
    x = 15.90/3.63
  6. Step 6: Final answer
    x = 4.38

Related Problems

Find fourth proportional to 1.82, 2.50 and 1.59
Half scale
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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.