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Finding the Fourth Proportional to 298.78, 412.30 and 167.76

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Solution

The fourth proportional to 298.78, 412.30 and 167.76 is: 231.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.78 : 412.30 = 167.76 : x
  2. Step 2: Convert to fraction form
    298.78/412.30 = 167.76/x
  3. Step 3: Cross multiply
    298.78x = 412.30 × 167.76
  4. Step 4: Simplify right side
    298.78x = 69,167.66
  5. Step 5: Solve for x
    x = 69,167.66/298.78
  6. Step 6: Final answer
    x = 231.50

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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.