Home / 8,075.20-12,112.80-5,310.40

Finding the Fourth Proportional to 8,075.20, 12,112.80 and 5,310.40

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Solution

The fourth proportional to 8,075.20, 12,112.80 and 5,310.40 is: 7,965.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,075.20 : 12,112.80 = 5,310.40 : x
  2. Step 2: Convert to fraction form
    8,075.20/12,112.80 = 5,310.40/x
  3. Step 3: Cross multiply
    8,075.20x = 12,112.80 × 5,310.40
  4. Step 4: Simplify right side
    8,075.20x = 64,323,813.12
  5. Step 5: Solve for x
    x = 64,323,813.12/8,075.20
  6. Step 6: Final answer
    x = 7,965.60

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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.