Home / 20,880.10-28,820.64-12,919.42

Finding the Fourth Proportional to 20,880.10, 28,820.64 and 12,919.42

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Solution

The fourth proportional to 20,880.10, 28,820.64 and 12,919.42 is: 17,832.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,880.10 : 28,820.64 = 12,919.42 : x
  2. Step 2: Convert to fraction form
    20,880.10/28,820.64 = 12,919.42/x
  3. Step 3: Cross multiply
    20,880.10x = 28,820.64 × 12,919.42
  4. Step 4: Simplify right side
    20,880.10x = 372,345,952.83
  5. Step 5: Solve for x
    x = 372,345,952.83/20,880.10
  6. Step 6: Final answer
    x = 17,832.58

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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.