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Finding the Fourth Proportional to 669.20, 1,003.68 and 236.36

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Solution

The fourth proportional to 669.20, 1,003.68 and 236.36 is: 354.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.20 : 1,003.68 = 236.36 : x
  2. Step 2: Convert to fraction form
    669.20/1,003.68 = 236.36/x
  3. Step 3: Cross multiply
    669.20x = 1,003.68 × 236.36
  4. Step 4: Simplify right side
    669.20x = 237,229.80
  5. Step 5: Solve for x
    x = 237,229.80/669.20
  6. Step 6: Final answer
    x = 354.50

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.