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Finding the Fourth Proportional to 181.84, 272.74 and 85.64

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Solution

The fourth proportional to 181.84, 272.74 and 85.64 is: 128.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.84 : 272.74 = 85.64 : x
  2. Step 2: Convert to fraction form
    181.84/272.74 = 85.64/x
  3. Step 3: Cross multiply
    181.84x = 272.74 × 85.64
  4. Step 4: Simplify right side
    181.84x = 23,357.45
  5. Step 5: Solve for x
    x = 23,357.45/181.84
  6. Step 6: Final answer
    x = 128.45

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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.