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Finding the Fourth Proportional to 261.90, 391.65 and 192.70

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Solution

The fourth proportional to 261.90, 391.65 and 192.70 is: 288.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.90 : 391.65 = 192.70 : x
  2. Step 2: Convert to fraction form
    261.90/391.65 = 192.70/x
  3. Step 3: Cross multiply
    261.90x = 391.65 × 192.70
  4. Step 4: Simplify right side
    261.90x = 75,470.96
  5. Step 5: Solve for x
    x = 75,470.96/261.90
  6. Step 6: Final answer
    x = 288.17

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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.