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Finding the Fourth Proportional to 993.92, 1,371.62 and 551.86

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Solution

The fourth proportional to 993.92, 1,371.62 and 551.86 is: 761.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.92 : 1,371.62 = 551.86 : x
  2. Step 2: Convert to fraction form
    993.92/1,371.62 = 551.86/x
  3. Step 3: Cross multiply
    993.92x = 1,371.62 × 551.86
  4. Step 4: Simplify right side
    993.92x = 756,942.21
  5. Step 5: Solve for x
    x = 756,942.21/993.92
  6. Step 6: Final answer
    x = 761.57

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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.