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Finding the Fourth Proportional to 143,987.57, 198,698.21 and 78,573.89

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Solution

The fourth proportional to 143,987.57, 198,698.21 and 78,573.89 is: 108,429.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,987.57 : 198,698.21 = 78,573.89 : x
  2. Step 2: Convert to fraction form
    143,987.57/198,698.21 = 78,573.89/x
  3. Step 3: Cross multiply
    143,987.57x = 198,698.21 × 78,573.89
  4. Step 4: Simplify right side
    143,987.57x = 15,612,490,902.87
  5. Step 5: Solve for x
    x = 15,612,490,902.87/143,987.57
  6. Step 6: Final answer
    x = 108,429.44

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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.