Home / 13,720.80-20,582.10-3,860.40

Finding the Fourth Proportional to 13,720.80, 20,582.10 and 3,860.40

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Solution

The fourth proportional to 13,720.80, 20,582.10 and 3,860.40 is: 5,790.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.80 : 20,582.10 = 3,860.40 : x
  2. Step 2: Convert to fraction form
    13,720.80/20,582.10 = 3,860.40/x
  3. Step 3: Cross multiply
    13,720.80x = 20,582.10 × 3,860.40
  4. Step 4: Simplify right side
    13,720.80x = 79,455,138.84
  5. Step 5: Solve for x
    x = 79,455,138.84/13,720.80
  6. Step 6: Final answer
    x = 5,790.85

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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.