Home / 21,105.12-31,662.48-11,239.20

Finding the Fourth Proportional to 21,105.12, 31,662.48 and 11,239.20

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Solution

The fourth proportional to 21,105.12, 31,662.48 and 11,239.20 is: 16,861.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,105.12 : 31,662.48 = 11,239.20 : x
  2. Step 2: Convert to fraction form
    21,105.12/31,662.48 = 11,239.20/x
  3. Step 3: Cross multiply
    21,105.12x = 31,662.48 × 11,239.20
  4. Step 4: Simplify right side
    21,105.12x = 355,860,945.22
  5. Step 5: Solve for x
    x = 355,860,945.22/21,105.12
  6. Step 6: Final answer
    x = 16,861.36

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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.