Home / 20,207.40-30,311.10-12,820.20

Finding the Fourth Proportional to 20,207.40, 30,311.10 and 12,820.20

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Solution

The fourth proportional to 20,207.40, 30,311.10 and 12,820.20 is: 19,230.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,207.40 : 30,311.10 = 12,820.20 : x
  2. Step 2: Convert to fraction form
    20,207.40/30,311.10 = 12,820.20/x
  3. Step 3: Cross multiply
    20,207.40x = 30,311.10 × 12,820.20
  4. Step 4: Simplify right side
    20,207.40x = 388,594,364.22
  5. Step 5: Solve for x
    x = 388,594,364.22/20,207.40
  6. Step 6: Final answer
    x = 19,230.30

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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.