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Finding the Fourth Proportional to 998.46, 1,376.96 and 684.18

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Solution

The fourth proportional to 998.46, 1,376.96 and 684.18 is: 943.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.46 : 1,376.96 = 684.18 : x
  2. Step 2: Convert to fraction form
    998.46/1,376.96 = 684.18/x
  3. Step 3: Cross multiply
    998.46x = 1,376.96 × 684.18
  4. Step 4: Simplify right side
    998.46x = 942,088.49
  5. Step 5: Solve for x
    x = 942,088.49/998.46
  6. Step 6: Final answer
    x = 943.54

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Double scale
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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.