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Finding the Fourth Proportional to 203.43, 305.16 and 87.90

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Solution

The fourth proportional to 203.43, 305.16 and 87.90 is: 131.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.43 : 305.16 = 87.90 : x
  2. Step 2: Convert to fraction form
    203.43/305.16 = 87.90/x
  3. Step 3: Cross multiply
    203.43x = 305.16 × 87.90
  4. Step 4: Simplify right side
    203.43x = 26,823.56
  5. Step 5: Solve for x
    x = 26,823.56/203.43
  6. Step 6: Final answer
    x = 131.86

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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.