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Finding the Fourth Proportional to 398.79, 549.80 and 339.54

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Solution

The fourth proportional to 398.79, 549.80 and 339.54 is: 468.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.79 : 549.80 = 339.54 : x
  2. Step 2: Convert to fraction form
    398.79/549.80 = 339.54/x
  3. Step 3: Cross multiply
    398.79x = 549.80 × 339.54
  4. Step 4: Simplify right side
    398.79x = 186,677.39
  5. Step 5: Solve for x
    x = 186,677.39/398.79
  6. Step 6: Final answer
    x = 468.11

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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.