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Finding the Fourth Proportional to 551.78, 761.43 and 303.09

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Solution

The fourth proportional to 551.78, 761.43 and 303.09 is: 418.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.78 : 761.43 = 303.09 : x
  2. Step 2: Convert to fraction form
    551.78/761.43 = 303.09/x
  3. Step 3: Cross multiply
    551.78x = 761.43 × 303.09
  4. Step 4: Simplify right side
    551.78x = 230,780.30
  5. Step 5: Solve for x
    x = 230,780.30/551.78
  6. Step 6: Final answer
    x = 418.25

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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.