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Finding the Fourth Proportional to 993.50, 1,371.08 and 551.39

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Solution

The fourth proportional to 993.50, 1,371.08 and 551.39 is: 760.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.50 : 1,371.08 = 551.39 : x
  2. Step 2: Convert to fraction form
    993.50/1,371.08 = 551.39/x
  3. Step 3: Cross multiply
    993.50x = 1,371.08 × 551.39
  4. Step 4: Simplify right side
    993.50x = 755,998.94
  5. Step 5: Solve for x
    x = 755,998.94/993.50
  6. Step 6: Final answer
    x = 760.95

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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.