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Finding the Fourth Proportional to 339.65, 509.09 and 156.66

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Solution

The fourth proportional to 339.65, 509.09 and 156.66 is: 234.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.65 : 509.09 = 156.66 : x
  2. Step 2: Convert to fraction form
    339.65/509.09 = 156.66/x
  3. Step 3: Cross multiply
    339.65x = 509.09 × 156.66
  4. Step 4: Simplify right side
    339.65x = 79,755.17
  5. Step 5: Solve for x
    x = 79,755.17/339.65
  6. Step 6: Final answer
    x = 234.81

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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.