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Finding the Fourth Proportional to 551.21, 761.40 and 385.97

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Solution

The fourth proportional to 551.21, 761.40 and 385.97 is: 533.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.21 : 761.40 = 385.97 : x
  2. Step 2: Convert to fraction form
    551.21/761.40 = 385.97/x
  3. Step 3: Cross multiply
    551.21x = 761.40 × 385.97
  4. Step 4: Simplify right side
    551.21x = 293,873.75
  5. Step 5: Solve for x
    x = 293,873.75/551.21
  6. Step 6: Final answer
    x = 533.15

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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.