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Finding the Fourth Proportional to 202.86, 279.90 and 115.56

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Solution

The fourth proportional to 202.86, 279.90 and 115.56 is: 159.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.86 : 279.90 = 115.56 : x
  2. Step 2: Convert to fraction form
    202.86/279.90 = 115.56/x
  3. Step 3: Cross multiply
    202.86x = 279.90 × 115.56
  4. Step 4: Simplify right side
    202.86x = 32,345.24
  5. Step 5: Solve for x
    x = 32,345.24/202.86
  6. Step 6: Final answer
    x = 159.45

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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.