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Finding the Fourth Proportional to 257.07, 354.61 and 239.66

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Solution

The fourth proportional to 257.07, 354.61 and 239.66 is: 330.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.07 : 354.61 = 239.66 : x
  2. Step 2: Convert to fraction form
    257.07/354.61 = 239.66/x
  3. Step 3: Cross multiply
    257.07x = 354.61 × 239.66
  4. Step 4: Simplify right side
    257.07x = 84,985.69
  5. Step 5: Solve for x
    x = 84,985.69/257.07
  6. Step 6: Final answer
    x = 330.59

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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.