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Finding the Fourth Proportional to 181.88, 272.88 and 85.70

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Solution

The fourth proportional to 181.88, 272.88 and 85.70 is: 128.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.88 : 272.88 = 85.70 : x
  2. Step 2: Convert to fraction form
    181.88/272.88 = 85.70/x
  3. Step 3: Cross multiply
    181.88x = 272.88 × 85.70
  4. Step 4: Simplify right side
    181.88x = 23,384.45
  5. Step 5: Solve for x
    x = 23,384.45/181.88
  6. Step 6: Final answer
    x = 128.57

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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.