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Finding the Fourth Proportional to 143,578.96, 198,115.32 and 79,915.12

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Solution

The fourth proportional to 143,578.96, 198,115.32 and 79,915.12 is: 110,269.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,578.96 : 198,115.32 = 79,915.12 : x
  2. Step 2: Convert to fraction form
    143,578.96/198,115.32 = 79,915.12/x
  3. Step 3: Cross multiply
    143,578.96x = 198,115.32 × 79,915.12
  4. Step 4: Simplify right side
    143,578.96x = 15,832,409,571.64
  5. Step 5: Solve for x
    x = 15,832,409,571.64/143,578.96
  6. Step 6: Final answer
    x = 110,269.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.