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Finding the Fourth Proportional to 30,640.60, 45,912.30 and 20,240.20

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Solution

The fourth proportional to 30,640.60, 45,912.30 and 20,240.20 is: 30,328.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,640.60 : 45,912.30 = 20,240.20 : x
  2. Step 2: Convert to fraction form
    30,640.60/45,912.30 = 20,240.20/x
  3. Step 3: Cross multiply
    30,640.60x = 45,912.30 × 20,240.20
  4. Step 4: Simplify right side
    30,640.60x = 929,274,134.46
  5. Step 5: Solve for x
    x = 929,274,134.46/30,640.60
  6. Step 6: Final answer
    x = 30,328.20

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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.