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Finding the Fourth Proportional to 239.80, 361.30 and 207.40

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Solution

The fourth proportional to 239.80, 361.30 and 207.40 is: 312.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.80 : 361.30 = 207.40 : x
  2. Step 2: Convert to fraction form
    239.80/361.30 = 207.40/x
  3. Step 3: Cross multiply
    239.80x = 361.30 × 207.40
  4. Step 4: Simplify right side
    239.80x = 74,933.62
  5. Step 5: Solve for x
    x = 74,933.62/239.80
  6. Step 6: Final answer
    x = 312.48

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.