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Finding the Fourth Proportional to 67,216.80, 100,825.20 and 56,719.20

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Solution

The fourth proportional to 67,216.80, 100,825.20 and 56,719.20 is: 85,078.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,216.80 : 100,825.20 = 56,719.20 : x
  2. Step 2: Convert to fraction form
    67,216.80/100,825.20 = 56,719.20/x
  3. Step 3: Cross multiply
    67,216.80x = 100,825.20 × 56,719.20
  4. Step 4: Simplify right side
    67,216.80x = 5,718,724,683.84
  5. Step 5: Solve for x
    x = 5,718,724,683.84/67,216.80
  6. Step 6: Final answer
    x = 85,078.80

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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.