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Finding the Fourth Proportional to 999.09, 1,378.65 and 600.69

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Solution

The fourth proportional to 999.09, 1,378.65 and 600.69 is: 828.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.09 : 1,378.65 = 600.69 : x
  2. Step 2: Convert to fraction form
    999.09/1,378.65 = 600.69/x
  3. Step 3: Cross multiply
    999.09x = 1,378.65 × 600.69
  4. Step 4: Simplify right side
    999.09x = 828,141.27
  5. Step 5: Solve for x
    x = 828,141.27/999.09
  6. Step 6: Final answer
    x = 828.90

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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.