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Finding the Fourth Proportional to 139,060.70, 191,902.65 and 78,631.34

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Solution

The fourth proportional to 139,060.70, 191,902.65 and 78,631.34 is: 108,510.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,060.70 : 191,902.65 = 78,631.34 : x
  2. Step 2: Convert to fraction form
    139,060.70/191,902.65 = 78,631.34/x
  3. Step 3: Cross multiply
    139,060.70x = 191,902.65 × 78,631.34
  4. Step 4: Simplify right side
    139,060.70x = 15,089,562,519.05
  5. Step 5: Solve for x
    x = 15,089,562,519.05/139,060.70
  6. Step 6: Final answer
    x = 108,510.62

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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.