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Finding the Fourth Proportional to 202.81, 279.78 and 115.48

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Solution

The fourth proportional to 202.81, 279.78 and 115.48 is: 159.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.81 : 279.78 = 115.48 : x
  2. Step 2: Convert to fraction form
    202.81/279.78 = 115.48/x
  3. Step 3: Cross multiply
    202.81x = 279.78 × 115.48
  4. Step 4: Simplify right side
    202.81x = 32,308.99
  5. Step 5: Solve for x
    x = 32,308.99/202.81
  6. Step 6: Final answer
    x = 159.31

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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.