Home / 129,698.10-178,952.90-78,709.68

Finding the Fourth Proportional to 129,698.10, 178,952.90 and 78,709.68

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Solution

The fourth proportional to 129,698.10, 178,952.90 and 78,709.68 is: 108,600.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,698.10 : 178,952.90 = 78,709.68 : x
  2. Step 2: Convert to fraction form
    129,698.10/178,952.90 = 78,709.68/x
  3. Step 3: Cross multiply
    129,698.10x = 178,952.90 × 78,709.68
  4. Step 4: Simplify right side
    129,698.10x = 14,085,324,205.76
  5. Step 5: Solve for x
    x = 14,085,324,205.76/129,698.10
  6. Step 6: Final answer
    x = 108,600.86

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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.