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Finding the Fourth Proportional to 8,586.80, 12,880.20 and 7,128.80

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Solution

The fourth proportional to 8,586.80, 12,880.20 and 7,128.80 is: 10,693.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,586.80 : 12,880.20 = 7,128.80 : x
  2. Step 2: Convert to fraction form
    8,586.80/12,880.20 = 7,128.80/x
  3. Step 3: Cross multiply
    8,586.80x = 12,880.20 × 7,128.80
  4. Step 4: Simplify right side
    8,586.80x = 91,820,369.76
  5. Step 5: Solve for x
    x = 91,820,369.76/8,586.80
  6. Step 6: Final answer
    x = 10,693.20

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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.