Home / 20,428.59-28,181.70-13,257.87

Finding the Fourth Proportional to 20,428.59, 28,181.70 and 13,257.87

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Solution

The fourth proportional to 20,428.59, 28,181.70 and 13,257.87 is: 18,289.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,428.59 : 28,181.70 = 13,257.87 : x
  2. Step 2: Convert to fraction form
    20,428.59/28,181.70 = 13,257.87/x
  3. Step 3: Cross multiply
    20,428.59x = 28,181.70 × 13,257.87
  4. Step 4: Simplify right side
    20,428.59x = 373,629,314.98
  5. Step 5: Solve for x
    x = 373,629,314.98/20,428.59
  6. Step 6: Final answer
    x = 18,289.53

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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.