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Finding the Fourth Proportional to 993.93, 1,371.61 and 551.83

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Solution

The fourth proportional to 993.93, 1,371.61 and 551.83 is: 761.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.93 : 1,371.61 = 551.83 : x
  2. Step 2: Convert to fraction form
    993.93/1,371.61 = 551.83/x
  3. Step 3: Cross multiply
    993.93x = 1,371.61 × 551.83
  4. Step 4: Simplify right side
    993.93x = 756,895.55
  5. Step 5: Solve for x
    x = 756,895.55/993.93
  6. Step 6: Final answer
    x = 761.52

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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.