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Finding the Fourth Proportional to 139,403.42, 192,370.44 and 78,972.83

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Solution

The fourth proportional to 139,403.42, 192,370.44 and 78,972.83 is: 108,978.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,403.42 : 192,370.44 = 78,972.83 : x
  2. Step 2: Convert to fraction form
    139,403.42/192,370.44 = 78,972.83/x
  3. Step 3: Cross multiply
    139,403.42x = 192,370.44 × 78,972.83
  4. Step 4: Simplify right side
    139,403.42x = 15,192,037,093.29
  5. Step 5: Solve for x
    x = 15,192,037,093.29/139,403.42
  6. Step 6: Final answer
    x = 108,978.94

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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.