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Finding the Fourth Proportional to 551.09, 761.30 and 440.42

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Solution

The fourth proportional to 551.09, 761.30 and 440.42 is: 608.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.09 : 761.30 = 440.42 : x
  2. Step 2: Convert to fraction form
    551.09/761.30 = 440.42/x
  3. Step 3: Cross multiply
    551.09x = 761.30 × 440.42
  4. Step 4: Simplify right side
    551.09x = 335,291.75
  5. Step 5: Solve for x
    x = 335,291.75/551.09
  6. Step 6: Final answer
    x = 608.42

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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.