Home / 20,311.90-28,043.46-13,145.35

Finding the Fourth Proportional to 20,311.90, 28,043.46 and 13,145.35

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Solution

The fourth proportional to 20,311.90, 28,043.46 and 13,145.35 is: 18,149.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,311.90 : 28,043.46 = 13,145.35 : x
  2. Step 2: Convert to fraction form
    20,311.90/28,043.46 = 13,145.35/x
  3. Step 3: Cross multiply
    20,311.90x = 28,043.46 × 13,145.35
  4. Step 4: Simplify right side
    20,311.90x = 368,641,096.91
  5. Step 5: Solve for x
    x = 368,641,096.91/20,311.90
  6. Step 6: Final answer
    x = 18,149.02

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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.