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Finding the Fourth Proportional to 20,999.62, 31,483.98 and 9,900.04

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Solution

The fourth proportional to 20,999.62, 31,483.98 and 9,900.04 is: 14,842.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.62 : 31,483.98 = 9,900.04 : x
  2. Step 2: Convert to fraction form
    20,999.62/31,483.98 = 9,900.04/x
  3. Step 3: Cross multiply
    20,999.62x = 31,483.98 × 9,900.04
  4. Step 4: Simplify right side
    20,999.62x = 311,692,661.36
  5. Step 5: Solve for x
    x = 311,692,661.36/20,999.62
  6. Step 6: Final answer
    x = 14,842.78

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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.