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Finding the Fourth Proportional to 993.81, 1,371.40 and 551.70

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Solution

The fourth proportional to 993.81, 1,371.40 and 551.70 is: 761.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.81 : 1,371.40 = 551.70 : x
  2. Step 2: Convert to fraction form
    993.81/1,371.40 = 551.70/x
  3. Step 3: Cross multiply
    993.81x = 1,371.40 × 551.70
  4. Step 4: Simplify right side
    993.81x = 756,601.38
  5. Step 5: Solve for x
    x = 756,601.38/993.81
  6. Step 6: Final answer
    x = 761.31

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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.