Home / 129,121.15-178,125.72-86,120.50

Finding the Fourth Proportional to 129,121.15, 178,125.72 and 86,120.50

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Solution

The fourth proportional to 129,121.15, 178,125.72 and 86,120.50 is: 118,805.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,121.15 : 178,125.72 = 86,120.50 : x
  2. Step 2: Convert to fraction form
    129,121.15/178,125.72 = 86,120.50/x
  3. Step 3: Cross multiply
    129,121.15x = 178,125.72 × 86,120.50
  4. Step 4: Simplify right side
    129,121.15x = 15,340,276,069.26
  5. Step 5: Solve for x
    x = 15,340,276,069.26/129,121.15
  6. Step 6: Final answer
    x = 118,805.29

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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.