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Finding the Fourth Proportional to 291.39, 401.75 and 212.45

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Solution

The fourth proportional to 291.39, 401.75 and 212.45 is: 292.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.39 : 401.75 = 212.45 : x
  2. Step 2: Convert to fraction form
    291.39/401.75 = 212.45/x
  3. Step 3: Cross multiply
    291.39x = 401.75 × 212.45
  4. Step 4: Simplify right side
    291.39x = 85,351.79
  5. Step 5: Solve for x
    x = 85,351.79/291.39
  6. Step 6: Final answer
    x = 292.91

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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.