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Finding the Fourth Proportional to 181.71, 272.57 and 85.50

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Solution

The fourth proportional to 181.71, 272.57 and 85.50 is: 128.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.71 : 272.57 = 85.50 : x
  2. Step 2: Convert to fraction form
    181.71/272.57 = 85.50/x
  3. Step 3: Cross multiply
    181.71x = 272.57 × 85.50
  4. Step 4: Simplify right side
    181.71x = 23,304.31
  5. Step 5: Solve for x
    x = 23,304.31/181.71
  6. Step 6: Final answer
    x = 128.25

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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.