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Finding the Fourth Proportional to 8,559.77, 11,815.88 and 5,372.21

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Solution

The fourth proportional to 8,559.77, 11,815.88 and 5,372.21 is: 7,415.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,559.77 : 11,815.88 = 5,372.21 : x
  2. Step 2: Convert to fraction form
    8,559.77/11,815.88 = 5,372.21/x
  3. Step 3: Cross multiply
    8,559.77x = 11,815.88 × 5,372.21
  4. Step 4: Simplify right side
    8,559.77x = 63,477,302.75
  5. Step 5: Solve for x
    x = 63,477,302.75/8,559.77
  6. Step 6: Final answer
    x = 7,415.78

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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.