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Finding the Fourth Proportional to 143,393.60, 197,885.44 and 78,865.64

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Solution

The fourth proportional to 143,393.60, 197,885.44 and 78,865.64 is: 108,835.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,393.60 : 197,885.44 = 78,865.64 : x
  2. Step 2: Convert to fraction form
    143,393.60/197,885.44 = 78,865.64/x
  3. Step 3: Cross multiply
    143,393.60x = 197,885.44 × 78,865.64
  4. Step 4: Simplify right side
    143,393.60x = 15,606,361,872.28
  5. Step 5: Solve for x
    x = 15,606,361,872.28/143,393.60
  6. Step 6: Final answer
    x = 108,835.83

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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.