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Finding the Fourth Proportional to 239.79, 359.46 and 85.62

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Solution

The fourth proportional to 239.79, 359.46 and 85.62 is: 128.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.79 : 359.46 = 85.62 : x
  2. Step 2: Convert to fraction form
    239.79/359.46 = 85.62/x
  3. Step 3: Cross multiply
    239.79x = 359.46 × 85.62
  4. Step 4: Simplify right side
    239.79x = 30,776.97
  5. Step 5: Solve for x
    x = 30,776.97/239.79
  6. Step 6: Final answer
    x = 128.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.