Home / 81,108.03-111,116.14-78,075.70

Finding the Fourth Proportional to 81,108.03, 111,116.14 and 78,075.70

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Solution

The fourth proportional to 81,108.03, 111,116.14 and 78,075.70 is: 106,961.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,108.03 : 111,116.14 = 78,075.70 : x
  2. Step 2: Convert to fraction form
    81,108.03/111,116.14 = 78,075.70/x
  3. Step 3: Cross multiply
    81,108.03x = 111,116.14 × 78,075.70
  4. Step 4: Simplify right side
    81,108.03x = 8,675,470,411.80
  5. Step 5: Solve for x
    x = 8,675,470,411.80/81,108.03
  6. Step 6: Final answer
    x = 106,961.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.