Home / 20,138.60-30,215.10-8,455.40

Finding the Fourth Proportional to 20,138.60, 30,215.10 and 8,455.40

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Solution

The fourth proportional to 20,138.60, 30,215.10 and 8,455.40 is: 12,686.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.60 : 30,215.10 = 8,455.40 : x
  2. Step 2: Convert to fraction form
    20,138.60/30,215.10 = 8,455.40/x
  3. Step 3: Cross multiply
    20,138.60x = 30,215.10 × 8,455.40
  4. Step 4: Simplify right side
    20,138.60x = 255,480,756.54
  5. Step 5: Solve for x
    x = 255,480,756.54/20,138.60
  6. Step 6: Final answer
    x = 12,686.12

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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.