Home / 129,670.40-178,767.60-81,899.84

Finding the Fourth Proportional to 129,670.40, 178,767.60 and 81,899.84

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Solution

The fourth proportional to 129,670.40, 178,767.60 and 81,899.84 is: 112,909.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,670.40 : 178,767.60 = 81,899.84 : x
  2. Step 2: Convert to fraction form
    129,670.40/178,767.60 = 81,899.84/x
  3. Step 3: Cross multiply
    129,670.40x = 178,767.60 × 81,899.84
  4. Step 4: Simplify right side
    129,670.40x = 14,641,037,837.18
  5. Step 5: Solve for x
    x = 14,641,037,837.18/129,670.40
  6. Step 6: Final answer
    x = 112,909.64

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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.