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Finding the Fourth Proportional to 551.76, 761.94 and 355.61

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Solution

The fourth proportional to 551.76, 761.94 and 355.61 is: 491.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.76 : 761.94 = 355.61 : x
  2. Step 2: Convert to fraction form
    551.76/761.94 = 355.61/x
  3. Step 3: Cross multiply
    551.76x = 761.94 × 355.61
  4. Step 4: Simplify right side
    551.76x = 270,949.67
  5. Step 5: Solve for x
    x = 270,949.67/551.76
  6. Step 6: Final answer
    x = 491.06

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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.