Home / 129,110.51-178,143.32-78,121.98

Finding the Fourth Proportional to 129,110.51, 178,143.32 and 78,121.98

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Solution

The fourth proportional to 129,110.51, 178,143.32 and 78,121.98 is: 107,790.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,110.51 : 178,143.32 = 78,121.98 : x
  2. Step 2: Convert to fraction form
    129,110.51/178,143.32 = 78,121.98/x
  3. Step 3: Cross multiply
    129,110.51x = 178,143.32 × 78,121.98
  4. Step 4: Simplify right side
    129,110.51x = 13,916,907,600.85
  5. Step 5: Solve for x
    x = 13,916,907,600.85/129,110.51
  6. Step 6: Final answer
    x = 107,790.66

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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.