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Finding the Fourth Proportional to 999.19, 1,378.82 and 551.03

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Solution

The fourth proportional to 999.19, 1,378.82 and 551.03 is: 760.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.19 : 1,378.82 = 551.03 : x
  2. Step 2: Convert to fraction form
    999.19/1,378.82 = 551.03/x
  3. Step 3: Cross multiply
    999.19x = 1,378.82 × 551.03
  4. Step 4: Simplify right side
    999.19x = 759,768.43
  5. Step 5: Solve for x
    x = 759,768.43/999.19
  6. Step 6: Final answer
    x = 760.39

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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.