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Finding the Fourth Proportional to 999.11, 1,378.19 and 684.23

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Solution

The fourth proportional to 999.11, 1,378.19 and 684.23 is: 943.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.11 : 1,378.19 = 684.23 : x
  2. Step 2: Convert to fraction form
    999.11/1,378.19 = 684.23/x
  3. Step 3: Cross multiply
    999.11x = 1,378.19 × 684.23
  4. Step 4: Simplify right side
    999.11x = 942,993.76
  5. Step 5: Solve for x
    x = 942,993.76/999.11
  6. Step 6: Final answer
    x = 943.83

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1.5x scale

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.