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Finding the Fourth Proportional to 288.75, 398.58 and 195.70

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Solution

The fourth proportional to 288.75, 398.58 and 195.70 is: 270.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.75 : 398.58 = 195.70 : x
  2. Step 2: Convert to fraction form
    288.75/398.58 = 195.70/x
  3. Step 3: Cross multiply
    288.75x = 398.58 × 195.70
  4. Step 4: Simplify right side
    288.75x = 78,002.11
  5. Step 5: Solve for x
    x = 78,002.11/288.75
  6. Step 6: Final answer
    x = 270.14

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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.