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Finding the Fourth Proportional to 486.56, 729.88 and 239.90

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Solution

The fourth proportional to 486.56, 729.88 and 239.90 is: 359.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.56 : 729.88 = 239.90 : x
  2. Step 2: Convert to fraction form
    486.56/729.88 = 239.90/x
  3. Step 3: Cross multiply
    486.56x = 729.88 × 239.90
  4. Step 4: Simplify right side
    486.56x = 175,093.96
  5. Step 5: Solve for x
    x = 175,093.96/486.56
  6. Step 6: Final answer
    x = 359.86

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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.