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Finding the Fourth Proportional to 987.40, 1,481.13 and 338.13

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Solution

The fourth proportional to 987.40, 1,481.13 and 338.13 is: 507.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.40 : 1,481.13 = 338.13 : x
  2. Step 2: Convert to fraction form
    987.40/1,481.13 = 338.13/x
  3. Step 3: Cross multiply
    987.40x = 1,481.13 × 338.13
  4. Step 4: Simplify right side
    987.40x = 500,814.49
  5. Step 5: Solve for x
    x = 500,814.49/987.40
  6. Step 6: Final answer
    x = 507.21

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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.