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Finding the Fourth Proportional to 18,373.50, 25,355.43 and 9,990

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Solution

The fourth proportional to 18,373.50, 25,355.43 and 9,990 is: 13,786.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,373.50 : 25,355.43 = 9,990 : x
  2. Step 2: Convert to fraction form
    18,373.50/25,355.43 = 9,990/x
  3. Step 3: Cross multiply
    18,373.50x = 25,355.43 × 9,990
  4. Step 4: Simplify right side
    18,373.50x = 253,300,745.70
  5. Step 5: Solve for x
    x = 253,300,745.70/18,373.50
  6. Step 6: Final answer
    x = 13,786.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.