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Finding the Fourth Proportional to 205.69, 308.61 and 90.07

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Solution

The fourth proportional to 205.69, 308.61 and 90.07 is: 135.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.69 : 308.61 = 90.07 : x
  2. Step 2: Convert to fraction form
    205.69/308.61 = 90.07/x
  3. Step 3: Cross multiply
    205.69x = 308.61 × 90.07
  4. Step 4: Simplify right side
    205.69x = 27,796.50
  5. Step 5: Solve for x
    x = 27,796.50/205.69
  6. Step 6: Final answer
    x = 135.14

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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.