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Finding the Fourth Proportional to 389.51, 581.73 and 331.11

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Solution

The fourth proportional to 389.51, 581.73 and 331.11 is: 494.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.51 : 581.73 = 331.11 : x
  2. Step 2: Convert to fraction form
    389.51/581.73 = 331.11/x
  3. Step 3: Cross multiply
    389.51x = 581.73 × 331.11
  4. Step 4: Simplify right side
    389.51x = 192,616.62
  5. Step 5: Solve for x
    x = 192,616.62/389.51
  6. Step 6: Final answer
    x = 494.51

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.