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Finding the Fourth Proportional to 202.18, 278.94 and 131.31

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Solution

The fourth proportional to 202.18, 278.94 and 131.31 is: 181.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.18 : 278.94 = 131.31 : x
  2. Step 2: Convert to fraction form
    202.18/278.94 = 131.31/x
  3. Step 3: Cross multiply
    202.18x = 278.94 × 131.31
  4. Step 4: Simplify right side
    202.18x = 36,627.61
  5. Step 5: Solve for x
    x = 36,627.61/202.18
  6. Step 6: Final answer
    x = 181.16

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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.