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Finding the Fourth Proportional to 239.96, 357.67 and 215.66

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Solution

The fourth proportional to 239.96, 357.67 and 215.66 is: 321.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.96 : 357.67 = 215.66 : x
  2. Step 2: Convert to fraction form
    239.96/357.67 = 215.66/x
  3. Step 3: Cross multiply
    239.96x = 357.67 × 215.66
  4. Step 4: Simplify right side
    239.96x = 77,135.06
  5. Step 5: Solve for x
    x = 77,135.06/239.96
  6. Step 6: Final answer
    x = 321.45

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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.