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Finding the Fourth Proportional to 551.75, 761.76 and 355.61

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Solution

The fourth proportional to 551.75, 761.76 and 355.61 is: 490.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.75 : 761.76 = 355.61 : x
  2. Step 2: Convert to fraction form
    551.75/761.76 = 355.61/x
  3. Step 3: Cross multiply
    551.75x = 761.76 × 355.61
  4. Step 4: Simplify right side
    551.75x = 270,883.89
  5. Step 5: Solve for x
    x = 270,883.89/551.75
  6. Step 6: Final answer
    x = 490.95

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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.