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Finding the Fourth Proportional to 239.99, 330.35 and 212.31

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Solution

The fourth proportional to 239.99, 330.35 and 212.31 is: 292.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.99 : 330.35 = 212.31 : x
  2. Step 2: Convert to fraction form
    239.99/330.35 = 212.31/x
  3. Step 3: Cross multiply
    239.99x = 330.35 × 212.31
  4. Step 4: Simplify right side
    239.99x = 70,135.55
  5. Step 5: Solve for x
    x = 70,135.55/239.99
  6. Step 6: Final answer
    x = 292.25

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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.