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Finding the Fourth Proportional to 993.88, 1,371.55 and 551.85

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Solution

The fourth proportional to 993.88, 1,371.55 and 551.85 is: 761.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.88 : 1,371.55 = 551.85 : x
  2. Step 2: Convert to fraction form
    993.88/1,371.55 = 551.85/x
  3. Step 3: Cross multiply
    993.88x = 1,371.55 × 551.85
  4. Step 4: Simplify right side
    993.88x = 756,889.87
  5. Step 5: Solve for x
    x = 756,889.87/993.88
  6. Step 6: Final answer
    x = 761.55

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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.