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Finding the Fourth Proportional to 143,578.63, 198,138.52 and 79,915.06

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Solution

The fourth proportional to 143,578.63, 198,138.52 and 79,915.06 is: 110,282.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,578.63 : 198,138.52 = 79,915.06 : x
  2. Step 2: Convert to fraction form
    143,578.63/198,138.52 = 79,915.06/x
  3. Step 3: Cross multiply
    143,578.63x = 198,138.52 × 79,915.06
  4. Step 4: Simplify right side
    143,578.63x = 15,834,251,714.11
  5. Step 5: Solve for x
    x = 15,834,251,714.11/143,578.63
  6. Step 6: Final answer
    x = 110,282.79

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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.