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Finding the Fourth Proportional to 618.98, 928.51 and 208.25

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Solution

The fourth proportional to 618.98, 928.51 and 208.25 is: 312.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.98 : 928.51 = 208.25 : x
  2. Step 2: Convert to fraction form
    618.98/928.51 = 208.25/x
  3. Step 3: Cross multiply
    618.98x = 928.51 × 208.25
  4. Step 4: Simplify right side
    618.98x = 193,357.04
  5. Step 5: Solve for x
    x = 193,357.04/618.98
  6. Step 6: Final answer
    x = 312.38

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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.