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Finding the Fourth Proportional to 239.88, 357.72 and 213.66

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Solution

The fourth proportional to 239.88, 357.72 and 213.66 is: 318.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.88 : 357.72 = 213.66 : x
  2. Step 2: Convert to fraction form
    239.88/357.72 = 213.66/x
  3. Step 3: Cross multiply
    239.88x = 357.72 × 213.66
  4. Step 4: Simplify right side
    239.88x = 76,430.46
  5. Step 5: Solve for x
    x = 76,430.46/239.88
  6. Step 6: Final answer
    x = 318.62

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.