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Finding the Fourth Proportional to 339.08, 508.98 and 217.45

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Solution

The fourth proportional to 339.08, 508.98 and 217.45 is: 326.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.08 : 508.98 = 217.45 : x
  2. Step 2: Convert to fraction form
    339.08/508.98 = 217.45/x
  3. Step 3: Cross multiply
    339.08x = 508.98 × 217.45
  4. Step 4: Simplify right side
    339.08x = 110,675.16
  5. Step 5: Solve for x
    x = 110,675.16/339.08
  6. Step 6: Final answer
    x = 326.40

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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.