Home / 8,128.32-11,222.26-6,639.80

Finding the Fourth Proportional to 8,128.32, 11,222.26 and 6,639.80

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Solution

The fourth proportional to 8,128.32, 11,222.26 and 6,639.80 is: 9,167.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,128.32 : 11,222.26 = 6,639.80 : x
  2. Step 2: Convert to fraction form
    8,128.32/11,222.26 = 6,639.80/x
  3. Step 3: Cross multiply
    8,128.32x = 11,222.26 × 6,639.80
  4. Step 4: Simplify right side
    8,128.32x = 74,513,561.95
  5. Step 5: Solve for x
    x = 74,513,561.95/8,128.32
  6. Step 6: Final answer
    x = 9,167.15

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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.