Home / 129,051.90-178,156.35-80,680.68

Finding the Fourth Proportional to 129,051.90, 178,156.35 and 80,680.68

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Solution

The fourth proportional to 129,051.90, 178,156.35 and 80,680.68 is: 111,379.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,051.90 : 178,156.35 = 80,680.68 : x
  2. Step 2: Convert to fraction form
    129,051.90/178,156.35 = 80,680.68/x
  3. Step 3: Cross multiply
    129,051.90x = 178,156.35 × 80,680.68
  4. Step 4: Simplify right side
    129,051.90x = 14,373,775,464.32
  5. Step 5: Solve for x
    x = 14,373,775,464.32/129,051.90
  6. Step 6: Final answer
    x = 111,379.81

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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.