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Finding the Fourth Proportional to 208.74, 288.18 and 135.18

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Solution

The fourth proportional to 208.74, 288.18 and 135.18 is: 186.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.74 : 288.18 = 135.18 : x
  2. Step 2: Convert to fraction form
    208.74/288.18 = 135.18/x
  3. Step 3: Cross multiply
    208.74x = 288.18 × 135.18
  4. Step 4: Simplify right side
    208.74x = 38,956.17
  5. Step 5: Solve for x
    x = 38,956.17/208.74
  6. Step 6: Final answer
    x = 186.63

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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.