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Finding the Fourth Proportional to 139,056.58, 191,896.90 and 78,639.08

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Solution

The fourth proportional to 139,056.58, 191,896.90 and 78,639.08 is: 108,521.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,056.58 : 191,896.90 = 78,639.08 : x
  2. Step 2: Convert to fraction form
    139,056.58/191,896.90 = 78,639.08/x
  3. Step 3: Cross multiply
    139,056.58x = 191,896.90 × 78,639.08
  4. Step 4: Simplify right side
    139,056.58x = 15,090,595,670.85
  5. Step 5: Solve for x
    x = 15,090,595,670.85/139,056.58
  6. Step 6: Final answer
    x = 108,521.26

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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.