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Finding the Fourth Proportional to 253.36, 380.08 and 212.88

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Solution

The fourth proportional to 253.36, 380.08 and 212.88 is: 319.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.36 : 380.08 = 212.88 : x
  2. Step 2: Convert to fraction form
    253.36/380.08 = 212.88/x
  3. Step 3: Cross multiply
    253.36x = 380.08 × 212.88
  4. Step 4: Simplify right side
    253.36x = 80,911.43
  5. Step 5: Solve for x
    x = 80,911.43/253.36
  6. Step 6: Final answer
    x = 319.35

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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.