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Finding the Fourth Proportional to 139,049.46, 191,876.45 and 78,611.72

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Solution

The fourth proportional to 139,049.46, 191,876.45 and 78,611.72 is: 108,477.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,049.46 : 191,876.45 = 78,611.72 : x
  2. Step 2: Convert to fraction form
    139,049.46/191,876.45 = 78,611.72/x
  3. Step 3: Cross multiply
    139,049.46x = 191,876.45 × 78,611.72
  4. Step 4: Simplify right side
    139,049.46x = 15,083,736,409.55
  5. Step 5: Solve for x
    x = 15,083,736,409.55/139,049.46
  6. Step 6: Final answer
    x = 108,477.49

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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.