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Finding the Fourth Proportional to 181.02, 249.85 and 128.58

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Solution

The fourth proportional to 181.02, 249.85 and 128.58 is: 177.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.02 : 249.85 = 128.58 : x
  2. Step 2: Convert to fraction form
    181.02/249.85 = 128.58/x
  3. Step 3: Cross multiply
    181.02x = 249.85 × 128.58
  4. Step 4: Simplify right side
    181.02x = 32,125.71
  5. Step 5: Solve for x
    x = 32,125.71/181.02
  6. Step 6: Final answer
    x = 177.47

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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.