Home / 129,581.28-178,827.62-72,220.64

Finding the Fourth Proportional to 129,581.28, 178,827.62 and 72,220.64

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Solution

The fourth proportional to 129,581.28, 178,827.62 and 72,220.64 is: 99,667.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,581.28 : 178,827.62 = 72,220.64 : x
  2. Step 2: Convert to fraction form
    129,581.28/178,827.62 = 72,220.64/x
  3. Step 3: Cross multiply
    129,581.28x = 178,827.62 × 72,220.64
  4. Step 4: Simplify right side
    129,581.28x = 12,915,043,910.84
  5. Step 5: Solve for x
    x = 12,915,043,910.84/129,581.28
  6. Step 6: Final answer
    x = 99,667.51

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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.