Home / 129,742.56-178,943.99-81,978.48

Finding the Fourth Proportional to 129,742.56, 178,943.99 and 81,978.48

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Solution

The fourth proportional to 129,742.56, 178,943.99 and 81,978.48 is: 113,066.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,742.56 : 178,943.99 = 81,978.48 : x
  2. Step 2: Convert to fraction form
    129,742.56/178,943.99 = 81,978.48/x
  3. Step 3: Cross multiply
    129,742.56x = 178,943.99 × 81,978.48
  4. Step 4: Simplify right side
    129,742.56x = 14,669,555,895.44
  5. Step 5: Solve for x
    x = 14,669,555,895.44/129,742.56
  6. Step 6: Final answer
    x = 113,066.64

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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.