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Finding the Fourth Proportional to 993.79, 1,371.36 and 551.67

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Solution

The fourth proportional to 993.79, 1,371.36 and 551.67 is: 761.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.79 : 1,371.36 = 551.67 : x
  2. Step 2: Convert to fraction form
    993.79/1,371.36 = 551.67/x
  3. Step 3: Cross multiply
    993.79x = 1,371.36 × 551.67
  4. Step 4: Simplify right side
    993.79x = 756,538.17
  5. Step 5: Solve for x
    x = 756,538.17/993.79
  6. Step 6: Final answer
    x = 761.27

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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.