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Finding the Fourth Proportional to 993.96, 1,371.74 and 551.95

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Solution

The fourth proportional to 993.96, 1,371.74 and 551.95 is: 761.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.96 : 1,371.74 = 551.95 : x
  2. Step 2: Convert to fraction form
    993.96/1,371.74 = 551.95/x
  3. Step 3: Cross multiply
    993.96x = 1,371.74 × 551.95
  4. Step 4: Simplify right side
    993.96x = 757,131.89
  5. Step 5: Solve for x
    x = 757,131.89/993.96
  6. Step 6: Final answer
    x = 761.73

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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.