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Finding the Fourth Proportional to 339.39, 509.13 and 122.90

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Solution

The fourth proportional to 339.39, 509.13 and 122.90 is: 184.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.39 : 509.13 = 122.90 : x
  2. Step 2: Convert to fraction form
    339.39/509.13 = 122.90/x
  3. Step 3: Cross multiply
    339.39x = 509.13 × 122.90
  4. Step 4: Simplify right side
    339.39x = 62,569.53
  5. Step 5: Solve for x
    x = 62,569.53/339.39
  6. Step 6: Final answer
    x = 184.36

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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.