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Finding the Fourth Proportional to 398.12, 547.62 and 339.80

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Solution

The fourth proportional to 398.12, 547.62 and 339.80 is: 467.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.12 : 547.62 = 339.80 : x
  2. Step 2: Convert to fraction form
    398.12/547.62 = 339.80/x
  3. Step 3: Cross multiply
    398.12x = 547.62 × 339.80
  4. Step 4: Simplify right side
    398.12x = 186,081.28
  5. Step 5: Solve for x
    x = 186,081.28/398.12
  6. Step 6: Final answer
    x = 467.40

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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.