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Finding the Fourth Proportional to 203.61, 280.21 and 156.79

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Solution

The fourth proportional to 203.61, 280.21 and 156.79 is: 215.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.61 : 280.21 = 156.79 : x
  2. Step 2: Convert to fraction form
    203.61/280.21 = 156.79/x
  3. Step 3: Cross multiply
    203.61x = 280.21 × 156.79
  4. Step 4: Simplify right side
    203.61x = 43,932.80
  5. Step 5: Solve for x
    x = 43,932.80/203.61
  6. Step 6: Final answer
    x = 215.77

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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.