Home / 20,755.86-31,131.49-7,428.32

Finding the Fourth Proportional to 20,755.86, 31,131.49 and 7,428.32

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Solution

The fourth proportional to 20,755.86, 31,131.49 and 7,428.32 is: 11,141.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,755.86 : 31,131.49 = 7,428.32 : x
  2. Step 2: Convert to fraction form
    20,755.86/31,131.49 = 7,428.32/x
  3. Step 3: Cross multiply
    20,755.86x = 31,131.49 × 7,428.32
  4. Step 4: Simplify right side
    20,755.86x = 231,254,632.66
  5. Step 5: Solve for x
    x = 231,254,632.66/20,755.86
  6. Step 6: Final answer
    x = 11,141.66

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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.