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Finding the Fourth Proportional to 288.73, 398.08 and 209.98

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Solution

The fourth proportional to 288.73, 398.08 and 209.98 is: 289.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.73 : 398.08 = 209.98 : x
  2. Step 2: Convert to fraction form
    288.73/398.08 = 209.98/x
  3. Step 3: Cross multiply
    288.73x = 398.08 × 209.98
  4. Step 4: Simplify right side
    288.73x = 83,588.84
  5. Step 5: Solve for x
    x = 83,588.84/288.73
  6. Step 6: Final answer
    x = 289.51

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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.