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Finding the Fourth Proportional to 288.70, 432.78 and 197.20

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Solution

The fourth proportional to 288.70, 432.78 and 197.20 is: 295.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.70 : 432.78 = 197.20 : x
  2. Step 2: Convert to fraction form
    288.70/432.78 = 197.20/x
  3. Step 3: Cross multiply
    288.70x = 432.78 × 197.20
  4. Step 4: Simplify right side
    288.70x = 85,344.22
  5. Step 5: Solve for x
    x = 85,344.22/288.70
  6. Step 6: Final answer
    x = 295.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.