Home / 13,790.12-20,688.42-3,929.54

Finding the Fourth Proportional to 13,790.12, 20,688.42 and 3,929.54

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Solution

The fourth proportional to 13,790.12, 20,688.42 and 3,929.54 is: 5,895.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,790.12 : 20,688.42 = 3,929.54 : x
  2. Step 2: Convert to fraction form
    13,790.12/20,688.42 = 3,929.54/x
  3. Step 3: Cross multiply
    13,790.12x = 20,688.42 × 3,929.54
  4. Step 4: Simplify right side
    13,790.12x = 81,295,870.48
  5. Step 5: Solve for x
    x = 81,295,870.48/13,790.12
  6. Step 6: Final answer
    x = 5,895.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.