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Finding the Fourth Proportional to 665.51, 998.19 and 178.61

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Solution

The fourth proportional to 665.51, 998.19 and 178.61 is: 267.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.51 : 998.19 = 178.61 : x
  2. Step 2: Convert to fraction form
    665.51/998.19 = 178.61/x
  3. Step 3: Cross multiply
    665.51x = 998.19 × 178.61
  4. Step 4: Simplify right side
    665.51x = 178,281.72
  5. Step 5: Solve for x
    x = 178,281.72/665.51
  6. Step 6: Final answer
    x = 267.89

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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.