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Finding the Fourth Proportional to 143,971.72, 198,671.84 and 79,441.72

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Solution

The fourth proportional to 143,971.72, 198,671.84 and 79,441.72 is: 109,624.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,971.72 : 198,671.84 = 79,441.72 : x
  2. Step 2: Convert to fraction form
    143,971.72/198,671.84 = 79,441.72/x
  3. Step 3: Cross multiply
    143,971.72x = 198,671.84 × 79,441.72
  4. Step 4: Simplify right side
    143,971.72x = 15,782,832,685.16
  5. Step 5: Solve for x
    x = 15,782,832,685.16/143,971.72
  6. Step 6: Final answer
    x = 109,624.53

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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.