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Finding the Fourth Proportional to 261.45, 391.43 and 170.19

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Solution

The fourth proportional to 261.45, 391.43 and 170.19 is: 254.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.45 : 391.43 = 170.19 : x
  2. Step 2: Convert to fraction form
    261.45/391.43 = 170.19/x
  3. Step 3: Cross multiply
    261.45x = 391.43 × 170.19
  4. Step 4: Simplify right side
    261.45x = 66,617.90
  5. Step 5: Solve for x
    x = 66,617.90/261.45
  6. Step 6: Final answer
    x = 254.80

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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.