Home / 13,438.67-20,155.30-8,438.81

Finding the Fourth Proportional to 13,438.67, 20,155.30 and 8,438.81

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Solution

The fourth proportional to 13,438.67, 20,155.30 and 8,438.81 is: 12,656.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,438.67 : 20,155.30 = 8,438.81 : x
  2. Step 2: Convert to fraction form
    13,438.67/20,155.30 = 8,438.81/x
  3. Step 3: Cross multiply
    13,438.67x = 20,155.30 × 8,438.81
  4. Step 4: Simplify right side
    13,438.67x = 170,086,625.32
  5. Step 5: Solve for x
    x = 170,086,625.32/13,438.67
  6. Step 6: Final answer
    x = 12,656.51

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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.