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Finding the Fourth Proportional to 261.84, 391.98 and 170.58

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Solution

The fourth proportional to 261.84, 391.98 and 170.58 is: 255.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.84 : 391.98 = 170.58 : x
  2. Step 2: Convert to fraction form
    261.84/391.98 = 170.58/x
  3. Step 3: Cross multiply
    261.84x = 391.98 × 170.58
  4. Step 4: Simplify right side
    261.84x = 66,863.95
  5. Step 5: Solve for x
    x = 66,863.95/261.84
  6. Step 6: Final answer
    x = 255.36

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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.