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Finding the Fourth Proportional to 8,991.80, 13,458.90 and 4,821.56

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Solution

The fourth proportional to 8,991.80, 13,458.90 and 4,821.56 is: 7,216.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,991.80 : 13,458.90 = 4,821.56 : x
  2. Step 2: Convert to fraction form
    8,991.80/13,458.90 = 4,821.56/x
  3. Step 3: Cross multiply
    8,991.80x = 13,458.90 × 4,821.56
  4. Step 4: Simplify right side
    8,991.80x = 64,892,893.88
  5. Step 5: Solve for x
    x = 64,892,893.88/8,991.80
  6. Step 6: Final answer
    x = 7,216.90

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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.