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Finding the Fourth Proportional to 8,617.04, 12,918.56 and 8,128.16

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Solution

The fourth proportional to 8,617.04, 12,918.56 and 8,128.16 is: 12,185.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,617.04 : 12,918.56 = 8,128.16 : x
  2. Step 2: Convert to fraction form
    8,617.04/12,918.56 = 8,128.16/x
  3. Step 3: Cross multiply
    8,617.04x = 12,918.56 × 8,128.16
  4. Step 4: Simplify right side
    8,617.04x = 105,004,122.65
  5. Step 5: Solve for x
    x = 105,004,122.65/8,617.04
  6. Step 6: Final answer
    x = 12,185.64

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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.