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Finding the Fourth Proportional to 821.19, 1,231.58 and 236.18

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Solution

The fourth proportional to 821.19, 1,231.58 and 236.18 is: 354.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.19 : 1,231.58 = 236.18 : x
  2. Step 2: Convert to fraction form
    821.19/1,231.58 = 236.18/x
  3. Step 3: Cross multiply
    821.19x = 1,231.58 × 236.18
  4. Step 4: Simplify right side
    821.19x = 290,874.56
  5. Step 5: Solve for x
    x = 290,874.56/821.19
  6. Step 6: Final answer
    x = 354.21

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Double scale
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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.