Home / 129,205.35-178,289.11-77,519.71

Finding the Fourth Proportional to 129,205.35, 178,289.11 and 77,519.71

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Solution

The fourth proportional to 129,205.35, 178,289.11 and 77,519.71 is: 106,968.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,205.35 : 178,289.11 = 77,519.71 : x
  2. Step 2: Convert to fraction form
    129,205.35/178,289.11 = 77,519.71/x
  3. Step 3: Cross multiply
    129,205.35x = 178,289.11 × 77,519.71
  4. Step 4: Simplify right side
    129,205.35x = 13,820,920,139.71
  5. Step 5: Solve for x
    x = 13,820,920,139.71/129,205.35
  6. Step 6: Final answer
    x = 106,968.63

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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.