Home / 20,480.10-30,720.15-13,919.10

Finding the Fourth Proportional to 20,480.10, 30,720.15 and 13,919.10

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Solution

The fourth proportional to 20,480.10, 30,720.15 and 13,919.10 is: 20,878.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,480.10 : 30,720.15 = 13,919.10 : x
  2. Step 2: Convert to fraction form
    20,480.10/30,720.15 = 13,919.10/x
  3. Step 3: Cross multiply
    20,480.10x = 30,720.15 × 13,919.10
  4. Step 4: Simplify right side
    20,480.10x = 427,596,839.87
  5. Step 5: Solve for x
    x = 427,596,839.87/20,480.10
  6. Step 6: Final answer
    x = 20,878.65

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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.