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Finding the Fourth Proportional to 20,899.20, 31,324.65 and 9,630.99

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Solution

The fourth proportional to 20,899.20, 31,324.65 and 9,630.99 is: 14,435.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,899.20 : 31,324.65 = 9,630.99 : x
  2. Step 2: Convert to fraction form
    20,899.20/31,324.65 = 9,630.99/x
  3. Step 3: Cross multiply
    20,899.20x = 31,324.65 × 9,630.99
  4. Step 4: Simplify right side
    20,899.20x = 301,687,390.90
  5. Step 5: Solve for x
    x = 301,687,390.90/20,899.20
  6. Step 6: Final answer
    x = 14,435.36

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1.5x scale

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.