Home / 20,857.55-28,769.36-12,903.71

Finding the Fourth Proportional to 20,857.55, 28,769.36 and 12,903.71

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Solution

The fourth proportional to 20,857.55, 28,769.36 and 12,903.71 is: 17,798.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,857.55 : 28,769.36 = 12,903.71 : x
  2. Step 2: Convert to fraction form
    20,857.55/28,769.36 = 12,903.71/x
  3. Step 3: Cross multiply
    20,857.55x = 28,769.36 × 12,903.71
  4. Step 4: Simplify right side
    20,857.55x = 371,231,269.96
  5. Step 5: Solve for x
    x = 371,231,269.96/20,857.55
  6. Step 6: Final answer
    x = 17,798.42

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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.