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Finding the Fourth Proportional to 288.87, 398.70 and 190.68

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Solution

The fourth proportional to 288.87, 398.70 and 190.68 is: 263.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.87 : 398.70 = 190.68 : x
  2. Step 2: Convert to fraction form
    288.87/398.70 = 190.68/x
  3. Step 3: Cross multiply
    288.87x = 398.70 × 190.68
  4. Step 4: Simplify right side
    288.87x = 76,024.12
  5. Step 5: Solve for x
    x = 76,024.12/288.87
  6. Step 6: Final answer
    x = 263.18

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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.