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Finding the Fourth Proportional to 8,128.93, 11,223.13 and 6,640.42

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Solution

The fourth proportional to 8,128.93, 11,223.13 and 6,640.42 is: 9,168.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,128.93 : 11,223.13 = 6,640.42 : x
  2. Step 2: Convert to fraction form
    8,128.93/11,223.13 = 6,640.42/x
  3. Step 3: Cross multiply
    8,128.93x = 11,223.13 × 6,640.42
  4. Step 4: Simplify right side
    8,128.93x = 74,526,296.91
  5. Step 5: Solve for x
    x = 74,526,296.91/8,128.93
  6. Step 6: Final answer
    x = 9,168.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.