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Finding the Fourth Proportional to 1,328.13, 1,992.51 and 938.90

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Solution

The fourth proportional to 1,328.13, 1,992.51 and 938.90 is: 1,408.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.13 : 1,992.51 = 938.90 : x
  2. Step 2: Convert to fraction form
    1,328.13/1,992.51 = 938.90/x
  3. Step 3: Cross multiply
    1,328.13x = 1,992.51 × 938.90
  4. Step 4: Simplify right side
    1,328.13x = 1,870,772.62
  5. Step 5: Solve for x
    x = 1,870,772.62/1,328.13
  6. Step 6: Final answer
    x = 1,408.58

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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.