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Finding the Fourth Proportional to 205.65, 308.40 and 61.32

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Solution

The fourth proportional to 205.65, 308.40 and 61.32 is: 91.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.65 : 308.40 = 61.32 : x
  2. Step 2: Convert to fraction form
    205.65/308.40 = 61.32/x
  3. Step 3: Cross multiply
    205.65x = 308.40 × 61.32
  4. Step 4: Simplify right side
    205.65x = 18,911.09
  5. Step 5: Solve for x
    x = 18,911.09/205.65
  6. Step 6: Final answer
    x = 91.96

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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.