Home / 20,860.47-28,761.62-13,775.67

Finding the Fourth Proportional to 20,860.47, 28,761.62 and 13,775.67

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Solution

The fourth proportional to 20,860.47, 28,761.62 and 13,775.67 is: 18,993.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,860.47 : 28,761.62 = 13,775.67 : x
  2. Step 2: Convert to fraction form
    20,860.47/28,761.62 = 13,775.67/x
  3. Step 3: Cross multiply
    20,860.47x = 28,761.62 × 13,775.67
  4. Step 4: Simplify right side
    20,860.47x = 396,210,516.91
  5. Step 5: Solve for x
    x = 396,210,516.91/20,860.47
  6. Step 6: Final answer
    x = 18,993.36

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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.