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Finding the Fourth Proportional to 8,129.32, 11,223.64 and 6,640.80

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Solution

The fourth proportional to 8,129.32, 11,223.64 and 6,640.80 is: 9,168.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,129.32 : 11,223.64 = 6,640.80 : x
  2. Step 2: Convert to fraction form
    8,129.32/11,223.64 = 6,640.80/x
  3. Step 3: Cross multiply
    8,129.32x = 11,223.64 × 6,640.80
  4. Step 4: Simplify right side
    8,129.32x = 74,533,948.51
  5. Step 5: Solve for x
    x = 74,533,948.51/8,129.32
  6. Step 6: Final answer
    x = 9,168.53

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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.