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Finding the Fourth Proportional to 143,390.60, 197,878.38 and 79,724.60

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Solution

The fourth proportional to 143,390.60, 197,878.38 and 79,724.60 is: 110,019.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,390.60 : 197,878.38 = 79,724.60 : x
  2. Step 2: Convert to fraction form
    143,390.60/197,878.38 = 79,724.60/x
  3. Step 3: Cross multiply
    143,390.60x = 197,878.38 × 79,724.60
  4. Step 4: Simplify right side
    143,390.60x = 15,775,774,694.15
  5. Step 5: Solve for x
    x = 15,775,774,694.15/143,390.60
  6. Step 6: Final answer
    x = 110,019.59

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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.