Home / 21,276.96-31,911.32-8,126.21

Finding the Fourth Proportional to 21,276.96, 31,911.32 and 8,126.21

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Solution

The fourth proportional to 21,276.96, 31,911.32 and 8,126.21 is: 12,187.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,276.96 : 31,911.32 = 8,126.21 : x
  2. Step 2: Convert to fraction form
    21,276.96/31,911.32 = 8,126.21/x
  3. Step 3: Cross multiply
    21,276.96x = 31,911.32 × 8,126.21
  4. Step 4: Simplify right side
    21,276.96x = 259,317,887.51
  5. Step 5: Solve for x
    x = 259,317,887.51/21,276.96
  6. Step 6: Final answer
    x = 12,187.73

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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.