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Finding the Fourth Proportional to 298.16, 447.20 and 278.72

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Solution

The fourth proportional to 298.16, 447.20 and 278.72 is: 418.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.16 : 447.20 = 278.72 : x
  2. Step 2: Convert to fraction form
    298.16/447.20 = 278.72/x
  3. Step 3: Cross multiply
    298.16x = 447.20 × 278.72
  4. Step 4: Simplify right side
    298.16x = 124,643.58
  5. Step 5: Solve for x
    x = 124,643.58/298.16
  6. Step 6: Final answer
    x = 418.04

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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.