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Finding the Fourth Proportional to 298.35, 447.12 and 257.58

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Solution

The fourth proportional to 298.35, 447.12 and 257.58 is: 386.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.35 : 447.12 = 257.58 : x
  2. Step 2: Convert to fraction form
    298.35/447.12 = 257.58/x
  3. Step 3: Cross multiply
    298.35x = 447.12 × 257.58
  4. Step 4: Simplify right side
    298.35x = 115,169.17
  5. Step 5: Solve for x
    x = 115,169.17/298.35
  6. Step 6: Final answer
    x = 386.02

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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.