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Finding the Fourth Proportional to 72,091.20, 108,136.80 and 60,427.20

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Solution

The fourth proportional to 72,091.20, 108,136.80 and 60,427.20 is: 90,640.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,091.20 : 108,136.80 = 60,427.20 : x
  2. Step 2: Convert to fraction form
    72,091.20/108,136.80 = 60,427.20/x
  3. Step 3: Cross multiply
    72,091.20x = 108,136.80 × 60,427.20
  4. Step 4: Simplify right side
    72,091.20x = 6,534,404,040.96
  5. Step 5: Solve for x
    x = 6,534,404,040.96/72,091.20
  6. Step 6: Final answer
    x = 90,640.80

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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.