Home / 129,414.64-178,564.75-81,640.30

Finding the Fourth Proportional to 129,414.64, 178,564.75 and 81,640.30

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Solution

The fourth proportional to 129,414.64, 178,564.75 and 81,640.30 is: 112,646.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,414.64 : 178,564.75 = 81,640.30 : x
  2. Step 2: Convert to fraction form
    129,414.64/178,564.75 = 81,640.30/x
  3. Step 3: Cross multiply
    129,414.64x = 178,564.75 × 81,640.30
  4. Step 4: Simplify right side
    129,414.64x = 14,578,079,759.43
  5. Step 5: Solve for x
    x = 14,578,079,759.43/129,414.64
  6. Step 6: Final answer
    x = 112,646.30

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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.