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Finding the Fourth Proportional to 993.20, 1,370.62 and 551.11

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Solution

The fourth proportional to 993.20, 1,370.62 and 551.11 is: 760.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.20 : 1,370.62 = 551.11 : x
  2. Step 2: Convert to fraction form
    993.20/1,370.62 = 551.11/x
  3. Step 3: Cross multiply
    993.20x = 1,370.62 × 551.11
  4. Step 4: Simplify right side
    993.20x = 755,356.91
  5. Step 5: Solve for x
    x = 755,356.91/993.20
  6. Step 6: Final answer
    x = 760.53

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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.