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Finding the Fourth Proportional to 999.11, 1,378.76 and 550.98

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Solution

The fourth proportional to 999.11, 1,378.76 and 550.98 is: 760.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.11 : 1,378.76 = 550.98 : x
  2. Step 2: Convert to fraction form
    999.11/1,378.76 = 550.98/x
  3. Step 3: Cross multiply
    999.11x = 1,378.76 × 550.98
  4. Step 4: Simplify right side
    999.11x = 759,664.88
  5. Step 5: Solve for x
    x = 759,664.88/999.11
  6. Step 6: Final answer
    x = 760.34

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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.