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Finding the Fourth Proportional to 988.14, 1,481.28 and 338.41

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Solution

The fourth proportional to 988.14, 1,481.28 and 338.41 is: 507.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.14 : 1,481.28 = 338.41 : x
  2. Step 2: Convert to fraction form
    988.14/1,481.28 = 338.41/x
  3. Step 3: Cross multiply
    988.14x = 1,481.28 × 338.41
  4. Step 4: Simplify right side
    988.14x = 501,279.96
  5. Step 5: Solve for x
    x = 501,279.96/988.14
  6. Step 6: Final answer
    x = 507.30

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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.