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Finding the Fourth Proportional to 339.94, 509.10 and 258.94

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Solution

The fourth proportional to 339.94, 509.10 and 258.94 is: 387.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.94 : 509.10 = 258.94 : x
  2. Step 2: Convert to fraction form
    339.94/509.10 = 258.94/x
  3. Step 3: Cross multiply
    339.94x = 509.10 × 258.94
  4. Step 4: Simplify right side
    339.94x = 131,826.35
  5. Step 5: Solve for x
    x = 131,826.35/339.94
  6. Step 6: Final answer
    x = 387.79

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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.