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Finding the Fourth Proportional to 259.15, 357.21 and 203.80

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Solution

The fourth proportional to 259.15, 357.21 and 203.80 is: 280.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.15 : 357.21 = 203.80 : x
  2. Step 2: Convert to fraction form
    259.15/357.21 = 203.80/x
  3. Step 3: Cross multiply
    259.15x = 357.21 × 203.80
  4. Step 4: Simplify right side
    259.15x = 72,799.40
  5. Step 5: Solve for x
    x = 72,799.40/259.15
  6. Step 6: Final answer
    x = 280.92

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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.