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Finding the Fourth Proportional to 84,172.80, 126,028.80 and 65,740.80

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Solution

The fourth proportional to 84,172.80, 126,028.80 and 65,740.80 is: 98,431.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,172.80 : 126,028.80 = 65,740.80 : x
  2. Step 2: Convert to fraction form
    84,172.80/126,028.80 = 65,740.80/x
  3. Step 3: Cross multiply
    84,172.80x = 126,028.80 × 65,740.80
  4. Step 4: Simplify right side
    84,172.80x = 8,285,234,135.04
  5. Step 5: Solve for x
    x = 8,285,234,135.04/84,172.80
  6. Step 6: Final answer
    x = 98,431.25

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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.