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Finding the Fourth Proportional to 339.49, 509.19 and 156.87

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Solution

The fourth proportional to 339.49, 509.19 and 156.87 is: 235.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.49 : 509.19 = 156.87 : x
  2. Step 2: Convert to fraction form
    339.49/509.19 = 156.87/x
  3. Step 3: Cross multiply
    339.49x = 509.19 × 156.87
  4. Step 4: Simplify right side
    339.49x = 79,876.05
  5. Step 5: Solve for x
    x = 79,876.05/339.49
  6. Step 6: Final answer
    x = 235.28

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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.