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Finding the Fourth Proportional to 11,203.40, 16,761.90 and 7,315.40

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Solution

The fourth proportional to 11,203.40, 16,761.90 and 7,315.40 is: 10,944.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,203.40 : 16,761.90 = 7,315.40 : x
  2. Step 2: Convert to fraction form
    11,203.40/16,761.90 = 7,315.40/x
  3. Step 3: Cross multiply
    11,203.40x = 16,761.90 × 7,315.40
  4. Step 4: Simplify right side
    11,203.40x = 122,620,003.26
  5. Step 5: Solve for x
    x = 122,620,003.26/11,203.40
  6. Step 6: Final answer
    x = 10,944.89

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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.