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Finding the Fourth Proportional to 288.10, 397.74 and 189.88

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Solution

The fourth proportional to 288.10, 397.74 and 189.88 is: 262.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.10 : 397.74 = 189.88 : x
  2. Step 2: Convert to fraction form
    288.10/397.74 = 189.88/x
  3. Step 3: Cross multiply
    288.10x = 397.74 × 189.88
  4. Step 4: Simplify right side
    288.10x = 75,522.87
  5. Step 5: Solve for x
    x = 75,522.87/288.10
  6. Step 6: Final answer
    x = 262.14

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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.