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Finding the Fourth Proportional to 8,855.10, 12,221.22 and 5,720.40

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Solution

The fourth proportional to 8,855.10, 12,221.22 and 5,720.40 is: 7,894.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,855.10 : 12,221.22 = 5,720.40 : x
  2. Step 2: Convert to fraction form
    8,855.10/12,221.22 = 5,720.40/x
  3. Step 3: Cross multiply
    8,855.10x = 12,221.22 × 5,720.40
  4. Step 4: Simplify right side
    8,855.10x = 69,910,266.89
  5. Step 5: Solve for x
    x = 69,910,266.89/8,855.10
  6. Step 6: Final answer
    x = 7,894.92

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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.