Home / 20,505.15-28,293.69-11,428.55

Finding the Fourth Proportional to 20,505.15, 28,293.69 and 11,428.55

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Solution

The fourth proportional to 20,505.15, 28,293.69 and 11,428.55 is: 15,769.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,505.15 : 28,293.69 = 11,428.55 : x
  2. Step 2: Convert to fraction form
    20,505.15/28,293.69 = 11,428.55/x
  3. Step 3: Cross multiply
    20,505.15x = 28,293.69 × 11,428.55
  4. Step 4: Simplify right side
    20,505.15x = 323,355,709.38
  5. Step 5: Solve for x
    x = 323,355,709.38/20,505.15
  6. Step 6: Final answer
    x = 15,769.49

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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.