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Finding the Fourth Proportional to 20,128.40, 30,192.60 and 10,912.40

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Solution

The fourth proportional to 20,128.40, 30,192.60 and 10,912.40 is: 16,368.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.40 : 30,192.60 = 10,912.40 : x
  2. Step 2: Convert to fraction form
    20,128.40/30,192.60 = 10,912.40/x
  3. Step 3: Cross multiply
    20,128.40x = 30,192.60 × 10,912.40
  4. Step 4: Simplify right side
    20,128.40x = 329,473,728.24
  5. Step 5: Solve for x
    x = 329,473,728.24/20,128.40
  6. Step 6: Final answer
    x = 16,368.60

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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.