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Finding the Fourth Proportional to 225.57, 311.43 and 155.76

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Solution

The fourth proportional to 225.57, 311.43 and 155.76 is: 215.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.57 : 311.43 = 155.76 : x
  2. Step 2: Convert to fraction form
    225.57/311.43 = 155.76/x
  3. Step 3: Cross multiply
    225.57x = 311.43 × 155.76
  4. Step 4: Simplify right side
    225.57x = 48,508.34
  5. Step 5: Solve for x
    x = 48,508.34/225.57
  6. Step 6: Final answer
    x = 215.05

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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.