Home / 20,490.55-28,277.83-11,415.90

Finding the Fourth Proportional to 20,490.55, 28,277.83 and 11,415.90

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Solution

The fourth proportional to 20,490.55, 28,277.83 and 11,415.90 is: 15,754.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.55 : 28,277.83 = 11,415.90 : x
  2. Step 2: Convert to fraction form
    20,490.55/28,277.83 = 11,415.90/x
  3. Step 3: Cross multiply
    20,490.55x = 28,277.83 × 11,415.90
  4. Step 4: Simplify right side
    20,490.55x = 322,816,857.76
  5. Step 5: Solve for x
    x = 322,816,857.76/20,490.55
  6. Step 6: Final answer
    x = 15,754.43

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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.