Home / 20,087.86-27,720.80-11,135.28

Finding the Fourth Proportional to 20,087.86, 27,720.80 and 11,135.28

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Solution

The fourth proportional to 20,087.86, 27,720.80 and 11,135.28 is: 15,366.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,087.86 : 27,720.80 = 11,135.28 : x
  2. Step 2: Convert to fraction form
    20,087.86/27,720.80 = 11,135.28/x
  3. Step 3: Cross multiply
    20,087.86x = 27,720.80 × 11,135.28
  4. Step 4: Simplify right side
    20,087.86x = 308,678,869.82
  5. Step 5: Solve for x
    x = 308,678,869.82/20,087.86
  6. Step 6: Final answer
    x = 15,366.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.