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Finding the Fourth Proportional to 618.98, 854.17 and 339.21

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Solution

The fourth proportional to 618.98, 854.17 and 339.21 is: 468.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.98 : 854.17 = 339.21 : x
  2. Step 2: Convert to fraction form
    618.98/854.17 = 339.21/x
  3. Step 3: Cross multiply
    618.98x = 854.17 × 339.21
  4. Step 4: Simplify right side
    618.98x = 289,744.28
  5. Step 5: Solve for x
    x = 289,744.28/618.98
  6. Step 6: Final answer
    x = 468.10

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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.