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Finding the Fourth Proportional to 288.55, 398.21 and 170.61

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Solution

The fourth proportional to 288.55, 398.21 and 170.61 is: 235.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.55 : 398.21 = 170.61 : x
  2. Step 2: Convert to fraction form
    288.55/398.21 = 170.61/x
  3. Step 3: Cross multiply
    288.55x = 398.21 × 170.61
  4. Step 4: Simplify right side
    288.55x = 67,938.61
  5. Step 5: Solve for x
    x = 67,938.61/288.55
  6. Step 6: Final answer
    x = 235.45

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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.