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Finding the Fourth Proportional to 80,792.30, 121,295.81 and 69,021.72

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Solution

The fourth proportional to 80,792.30, 121,295.81 and 69,021.72 is: 103,624.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,792.30 : 121,295.81 = 69,021.72 : x
  2. Step 2: Convert to fraction form
    80,792.30/121,295.81 = 69,021.72/x
  3. Step 3: Cross multiply
    80,792.30x = 121,295.81 × 69,021.72
  4. Step 4: Simplify right side
    80,792.30x = 8,372,045,607.55
  5. Step 5: Solve for x
    x = 8,372,045,607.55/80,792.30
  6. Step 6: Final answer
    x = 103,624.30

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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.