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Finding the Fourth Proportional to 298.72, 412.40 and 193.92

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Solution

The fourth proportional to 298.72, 412.40 and 193.92 is: 267.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.72 : 412.40 = 193.92 : x
  2. Step 2: Convert to fraction form
    298.72/412.40 = 193.92/x
  3. Step 3: Cross multiply
    298.72x = 412.40 × 193.92
  4. Step 4: Simplify right side
    298.72x = 79,972.61
  5. Step 5: Solve for x
    x = 79,972.61/298.72
  6. Step 6: Final answer
    x = 267.72

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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.