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Finding the Fourth Proportional to 20,464.64, 30,690.90 and 8,775.08

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Solution

The fourth proportional to 20,464.64, 30,690.90 and 8,775.08 is: 13,160.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,464.64 : 30,690.90 = 8,775.08 : x
  2. Step 2: Convert to fraction form
    20,464.64/30,690.90 = 8,775.08/x
  3. Step 3: Cross multiply
    20,464.64x = 30,690.90 × 8,775.08
  4. Step 4: Simplify right side
    20,464.64x = 269,315,102.77
  5. Step 5: Solve for x
    x = 269,315,102.77/20,464.64
  6. Step 6: Final answer
    x = 13,160.02

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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.