Home / 20,553.21-28,382.58-15,128.07

Finding the Fourth Proportional to 20,553.21, 28,382.58 and 15,128.07

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Solution

The fourth proportional to 20,553.21, 28,382.58 and 15,128.07 is: 20,890.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,553.21 : 28,382.58 = 15,128.07 : x
  2. Step 2: Convert to fraction form
    20,553.21/28,382.58 = 15,128.07/x
  3. Step 3: Cross multiply
    20,553.21x = 28,382.58 × 15,128.07
  4. Step 4: Simplify right side
    20,553.21x = 429,373,657.02
  5. Step 5: Solve for x
    x = 429,373,657.02/20,553.21
  6. Step 6: Final answer
    x = 20,890.83

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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.