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Finding the Fourth Proportional to 551.81, 761.50 and 330.78

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Solution

The fourth proportional to 551.81, 761.50 and 330.78 is: 456.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.81 : 761.50 = 330.78 : x
  2. Step 2: Convert to fraction form
    551.81/761.50 = 330.78/x
  3. Step 3: Cross multiply
    551.81x = 761.50 × 330.78
  4. Step 4: Simplify right side
    551.81x = 251,892.24
  5. Step 5: Solve for x
    x = 251,892.24/551.81
  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.