Home / 129,107.36-178,168.26-72,518.78

Finding the Fourth Proportional to 129,107.36, 178,168.26 and 72,518.78

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Solution

The fourth proportional to 129,107.36, 178,168.26 and 72,518.78 is: 100,075.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,107.36 : 178,168.26 = 72,518.78 : x
  2. Step 2: Convert to fraction form
    129,107.36/178,168.26 = 72,518.78/x
  3. Step 3: Cross multiply
    129,107.36x = 178,168.26 × 72,518.78
  4. Step 4: Simplify right side
    129,107.36x = 12,920,544,849.92
  5. Step 5: Solve for x
    x = 12,920,544,849.92/129,107.36
  6. Step 6: Final answer
    x = 100,075.97

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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.