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Finding the Fourth Proportional to 72,128.40, 108,192.60 and 71,091.60

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Solution

The fourth proportional to 72,128.40, 108,192.60 and 71,091.60 is: 106,637.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,128.40 : 108,192.60 = 71,091.60 : x
  2. Step 2: Convert to fraction form
    72,128.40/108,192.60 = 71,091.60/x
  3. Step 3: Cross multiply
    72,128.40x = 108,192.60 × 71,091.60
  4. Step 4: Simplify right side
    72,128.40x = 7,691,585,042.16
  5. Step 5: Solve for x
    x = 7,691,585,042.16/72,128.40
  6. Step 6: Final answer
    x = 106,637.40

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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.