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Finding the Fourth Proportional to 208.81, 288.26 and 135.20

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Solution

The fourth proportional to 208.81, 288.26 and 135.20 is: 186.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.81 : 288.26 = 135.20 : x
  2. Step 2: Convert to fraction form
    208.81/288.26 = 135.20/x
  3. Step 3: Cross multiply
    208.81x = 288.26 × 135.20
  4. Step 4: Simplify right side
    208.81x = 38,973.30
  5. Step 5: Solve for x
    x = 38,973.30/208.81
  6. Step 6: Final answer
    x = 186.64

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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.