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Finding the Fourth Proportional to 339.68, 509.45 and 272.25

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Solution

The fourth proportional to 339.68, 509.45 and 272.25 is: 408.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.68 : 509.45 = 272.25 : x
  2. Step 2: Convert to fraction form
    339.68/509.45 = 272.25/x
  3. Step 3: Cross multiply
    339.68x = 509.45 × 272.25
  4. Step 4: Simplify right side
    339.68x = 138,696.40
  5. Step 5: Solve for x
    x = 138,696.40/339.68
  6. Step 6: Final answer
    x = 408.32

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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.