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Finding the Fourth Proportional to 181.81, 272.35 and 84.18

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Solution

The fourth proportional to 181.81, 272.35 and 84.18 is: 126.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.81 : 272.35 = 84.18 : x
  2. Step 2: Convert to fraction form
    181.81/272.35 = 84.18/x
  3. Step 3: Cross multiply
    181.81x = 272.35 × 84.18
  4. Step 4: Simplify right side
    181.81x = 22,925.41
  5. Step 5: Solve for x
    x = 22,925.41/181.81
  6. Step 6: Final answer
    x = 126.09

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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.