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Finding the Fourth Proportional to 20,143.60, 30,229.80 and 8,465.20

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Solution

The fourth proportional to 20,143.60, 30,229.80 and 8,465.20 is: 12,703.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,143.60 : 30,229.80 = 8,465.20 : x
  2. Step 2: Convert to fraction form
    20,143.60/30,229.80 = 8,465.20/x
  3. Step 3: Cross multiply
    20,143.60x = 30,229.80 × 8,465.20
  4. Step 4: Simplify right side
    20,143.60x = 255,901,302.96
  5. Step 5: Solve for x
    x = 255,901,302.96/20,143.60
  6. Step 6: Final answer
    x = 12,703.85

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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.