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Finding the Fourth Proportional to 993.66, 1,371.27 and 551.57

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Solution

The fourth proportional to 993.66, 1,371.27 and 551.57 is: 761.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.66 : 1,371.27 = 551.57 : x
  2. Step 2: Convert to fraction form
    993.66/1,371.27 = 551.57/x
  3. Step 3: Cross multiply
    993.66x = 1,371.27 × 551.57
  4. Step 4: Simplify right side
    993.66x = 756,344.54
  5. Step 5: Solve for x
    x = 756,344.54/993.66
  6. Step 6: Final answer
    x = 761.17

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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.