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Finding the Fourth Proportional to 551.85, 761.36 and 330.87

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Solution

The fourth proportional to 551.85, 761.36 and 330.87 is: 456.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.85 : 761.36 = 330.87 : x
  2. Step 2: Convert to fraction form
    551.85/761.36 = 330.87/x
  3. Step 3: Cross multiply
    551.85x = 761.36 × 330.87
  4. Step 4: Simplify right side
    551.85x = 251,911.18
  5. Step 5: Solve for x
    x = 251,911.18/551.85
  6. Step 6: Final answer
    x = 456.48

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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.