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Finding the Fourth Proportional to 202.79, 304.34 and 81.06

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Solution

The fourth proportional to 202.79, 304.34 and 81.06 is: 121.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.79 : 304.34 = 81.06 : x
  2. Step 2: Convert to fraction form
    202.79/304.34 = 81.06/x
  3. Step 3: Cross multiply
    202.79x = 304.34 × 81.06
  4. Step 4: Simplify right side
    202.79x = 24,669.40
  5. Step 5: Solve for x
    x = 24,669.40/202.79
  6. Step 6: Final answer
    x = 121.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.