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Finding the Fourth Proportional to 298.78, 448.49 and 253.58

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Solution

The fourth proportional to 298.78, 448.49 and 253.58 is: 380.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.78 : 448.49 = 253.58 : x
  2. Step 2: Convert to fraction form
    298.78/448.49 = 253.58/x
  3. Step 3: Cross multiply
    298.78x = 448.49 × 253.58
  4. Step 4: Simplify right side
    298.78x = 113,728.09
  5. Step 5: Solve for x
    x = 113,728.09/298.78
  6. Step 6: Final answer
    x = 380.64

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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.