Home / 12,075.80-18,113.70-8,139.20

Finding the Fourth Proportional to 12,075.80, 18,113.70 and 8,139.20

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Solution

The fourth proportional to 12,075.80, 18,113.70 and 8,139.20 is: 12,208.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,075.80 : 18,113.70 = 8,139.20 : x
  2. Step 2: Convert to fraction form
    12,075.80/18,113.70 = 8,139.20/x
  3. Step 3: Cross multiply
    12,075.80x = 18,113.70 × 8,139.20
  4. Step 4: Simplify right side
    12,075.80x = 147,431,027.04
  5. Step 5: Solve for x
    x = 147,431,027.04/12,075.80
  6. Step 6: Final answer
    x = 12,208.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.