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Finding the Fourth Proportional to 8,554.80, 11,820.60 and 6,999.60

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Solution

The fourth proportional to 8,554.80, 11,820.60 and 6,999.60 is: 9,671.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,554.80 : 11,820.60 = 6,999.60 : x
  2. Step 2: Convert to fraction form
    8,554.80/11,820.60 = 6,999.60/x
  3. Step 3: Cross multiply
    8,554.80x = 11,820.60 × 6,999.60
  4. Step 4: Simplify right side
    8,554.80x = 82,739,471.76
  5. Step 5: Solve for x
    x = 82,739,471.76/8,554.80
  6. Step 6: Final answer
    x = 9,671.70

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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.