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Finding the Fourth Proportional to 551.39, 761.37 and 355.24

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Solution

The fourth proportional to 551.39, 761.37 and 355.24 is: 490.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.39 : 761.37 = 355.24 : x
  2. Step 2: Convert to fraction form
    551.39/761.37 = 355.24/x
  3. Step 3: Cross multiply
    551.39x = 761.37 × 355.24
  4. Step 4: Simplify right side
    551.39x = 270,473.84
  5. Step 5: Solve for x
    x = 270,473.84/551.39
  6. Step 6: Final answer
    x = 490.53

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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.