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Finding the Fourth Proportional to 288.97, 398.86 and 190.76

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Solution

The fourth proportional to 288.97, 398.86 and 190.76 is: 263.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.97 : 398.86 = 190.76 : x
  2. Step 2: Convert to fraction form
    288.97/398.86 = 190.76/x
  3. Step 3: Cross multiply
    288.97x = 398.86 × 190.76
  4. Step 4: Simplify right side
    288.97x = 76,084.06
  5. Step 5: Solve for x
    x = 76,084.06/288.97
  6. Step 6: Final answer
    x = 263.30

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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.