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Finding the Fourth Proportional to 993.92, 1,371.67 and 551.87

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Solution

The fourth proportional to 993.92, 1,371.67 and 551.87 is: 761.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.92 : 1,371.67 = 551.87 : x
  2. Step 2: Convert to fraction form
    993.92/1,371.67 = 551.87/x
  3. Step 3: Cross multiply
    993.92x = 1,371.67 × 551.87
  4. Step 4: Simplify right side
    993.92x = 756,983.52
  5. Step 5: Solve for x
    x = 756,983.52/993.92
  6. Step 6: Final answer
    x = 761.61

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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.