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Finding the Fourth Proportional to 8,620.80, 12,931.20 and 3,075.54

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Solution

The fourth proportional to 8,620.80, 12,931.20 and 3,075.54 is: 4,613.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,620.80 : 12,931.20 = 3,075.54 : x
  2. Step 2: Convert to fraction form
    8,620.80/12,931.20 = 3,075.54/x
  3. Step 3: Cross multiply
    8,620.80x = 12,931.20 × 3,075.54
  4. Step 4: Simplify right side
    8,620.80x = 39,770,422.85
  5. Step 5: Solve for x
    x = 39,770,422.85/8,620.80
  6. Step 6: Final answer
    x = 4,613.31

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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.