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Finding the Fourth Proportional to 339.53, 508.45 and 217.42

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Solution

The fourth proportional to 339.53, 508.45 and 217.42 is: 325.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.53 : 508.45 = 217.42 : x
  2. Step 2: Convert to fraction form
    339.53/508.45 = 217.42/x
  3. Step 3: Cross multiply
    339.53x = 508.45 × 217.42
  4. Step 4: Simplify right side
    339.53x = 110,547.20
  5. Step 5: Solve for x
    x = 110,547.20/339.53
  6. Step 6: Final answer
    x = 325.59

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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.