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Finding the Fourth Proportional to 988.92, 1,481.18 and 815.18

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Solution

The fourth proportional to 988.92, 1,481.18 and 815.18 is: 1,220.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.92 : 1,481.18 = 815.18 : x
  2. Step 2: Convert to fraction form
    988.92/1,481.18 = 815.18/x
  3. Step 3: Cross multiply
    988.92x = 1,481.18 × 815.18
  4. Step 4: Simplify right side
    988.92x = 1,207,428.31
  5. Step 5: Solve for x
    x = 1,207,428.31/988.92
  6. Step 6: Final answer
    x = 1,220.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.