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Finding the Fourth Proportional to 288.48, 397.72 and 190.20

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Solution

The fourth proportional to 288.48, 397.72 and 190.20 is: 262.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.48 : 397.72 = 190.20 : x
  2. Step 2: Convert to fraction form
    288.48/397.72 = 190.20/x
  3. Step 3: Cross multiply
    288.48x = 397.72 × 190.20
  4. Step 4: Simplify right side
    288.48x = 75,646.34
  5. Step 5: Solve for x
    x = 75,646.34/288.48
  6. Step 6: Final answer
    x = 262.22

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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.