Home / 129,712.25-178,986.96-72,338.12

Finding the Fourth Proportional to 129,712.25, 178,986.96 and 72,338.12

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Solution

The fourth proportional to 129,712.25, 178,986.96 and 72,338.12 is: 99,817.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,712.25 : 178,986.96 = 72,338.12 : x
  2. Step 2: Convert to fraction form
    129,712.25/178,986.96 = 72,338.12/x
  3. Step 3: Cross multiply
    129,712.25x = 178,986.96 × 72,338.12
  4. Step 4: Simplify right side
    129,712.25x = 12,947,579,295.98
  5. Step 5: Solve for x
    x = 12,947,579,295.98/129,712.25
  6. Step 6: Final answer
    x = 99,817.71

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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.