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Finding the Fourth Proportional to 339.88, 509.68 and 123.48

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Solution

The fourth proportional to 339.88, 509.68 and 123.48 is: 185.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.88 : 509.68 = 123.48 : x
  2. Step 2: Convert to fraction form
    339.88/509.68 = 123.48/x
  3. Step 3: Cross multiply
    339.88x = 509.68 × 123.48
  4. Step 4: Simplify right side
    339.88x = 62,935.29
  5. Step 5: Solve for x
    x = 62,935.29/339.88
  6. Step 6: Final answer
    x = 185.17

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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.