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Finding the Fourth Proportional to 551.54, 761.18 and 355.21

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Solution

The fourth proportional to 551.54, 761.18 and 355.21 is: 490.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.54 : 761.18 = 355.21 : x
  2. Step 2: Convert to fraction form
    551.54/761.18 = 355.21/x
  3. Step 3: Cross multiply
    551.54x = 761.18 × 355.21
  4. Step 4: Simplify right side
    551.54x = 270,375.07
  5. Step 5: Solve for x
    x = 270,375.07/551.54
  6. Step 6: Final answer
    x = 490.22

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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.