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Finding the Fourth Proportional to 129,790.58, 179,123.54 and 78,791.49

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Solution

The fourth proportional to 129,790.58, 179,123.54 and 78,791.49 is: 108,739.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,790.58 : 179,123.54 = 78,791.49 : x
  2. Step 2: Convert to fraction form
    129,790.58/179,123.54 = 78,791.49/x
  3. Step 3: Cross multiply
    129,790.58x = 179,123.54 × 78,791.49
  4. Step 4: Simplify right side
    129,790.58x = 14,113,410,216.72
  5. Step 5: Solve for x
    x = 14,113,410,216.72/129,790.58
  6. Step 6: Final answer
    x = 108,739.87

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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.