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Finding the Fourth Proportional to 301.11, 415.28 and 212.88

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Solution

The fourth proportional to 301.11, 415.28 and 212.88 is: 293.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    301.11 : 415.28 = 212.88 : x
  2. Step 2: Convert to fraction form
    301.11/415.28 = 212.88/x
  3. Step 3: Cross multiply
    301.11x = 415.28 × 212.88
  4. Step 4: Simplify right side
    301.11x = 88,404.81
  5. Step 5: Solve for x
    x = 88,404.81/301.11
  6. Step 6: Final answer
    x = 293.60

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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.