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Finding the Fourth Proportional to 339.57, 509.34 and 123.15

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Solution

The fourth proportional to 339.57, 509.34 and 123.15 is: 184.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.57 : 509.34 = 123.15 : x
  2. Step 2: Convert to fraction form
    339.57/509.34 = 123.15/x
  3. Step 3: Cross multiply
    339.57x = 509.34 × 123.15
  4. Step 4: Simplify right side
    339.57x = 62,725.22
  5. Step 5: Solve for x
    x = 62,725.22/339.57
  6. Step 6: Final answer
    x = 184.72

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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.