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Finding the Fourth Proportional to 344.74, 517.28 and 139.45

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Solution

The fourth proportional to 344.74, 517.28 and 139.45 is: 209.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    344.74 : 517.28 = 139.45 : x
  2. Step 2: Convert to fraction form
    344.74/517.28 = 139.45/x
  3. Step 3: Cross multiply
    344.74x = 517.28 × 139.45
  4. Step 4: Simplify right side
    344.74x = 72,134.70
  5. Step 5: Solve for x
    x = 72,134.70/344.74
  6. Step 6: Final answer
    x = 209.24

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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.