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Finding the Fourth Proportional to 143,357.70, 197,838.73 and 78,831.85

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Solution

The fourth proportional to 143,357.70, 197,838.73 and 78,831.85 is: 108,790.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,357.70 : 197,838.73 = 78,831.85 : x
  2. Step 2: Convert to fraction form
    143,357.70/197,838.73 = 78,831.85/x
  3. Step 3: Cross multiply
    143,357.70x = 197,838.73 × 78,831.85
  4. Step 4: Simplify right side
    143,357.70x = 15,595,993,087.55
  5. Step 5: Solve for x
    x = 15,595,993,087.55/143,357.70
  6. Step 6: Final answer
    x = 108,790.76

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1.5x scale

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.