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Finding the Fourth Proportional to 339.80, 469.14 and 306.59

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Solution

The fourth proportional to 339.80, 469.14 and 306.59 is: 423.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.80 : 469.14 = 306.59 : x
  2. Step 2: Convert to fraction form
    339.80/469.14 = 306.59/x
  3. Step 3: Cross multiply
    339.80x = 469.14 × 306.59
  4. Step 4: Simplify right side
    339.80x = 143,833.63
  5. Step 5: Solve for x
    x = 143,833.63/339.80
  6. Step 6: Final answer
    x = 423.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.