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Finding the Fourth Proportional to 18,361.64, 25,338.72 and 9,978.20

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Solution

The fourth proportional to 18,361.64, 25,338.72 and 9,978.20 is: 13,769.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,361.64 : 25,338.72 = 9,978.20 : x
  2. Step 2: Convert to fraction form
    18,361.64/25,338.72 = 9,978.20/x
  3. Step 3: Cross multiply
    18,361.64x = 25,338.72 × 9,978.20
  4. Step 4: Simplify right side
    18,361.64x = 252,834,815.90
  5. Step 5: Solve for x
    x = 252,834,815.90/18,361.64
  6. Step 6: Final answer
    x = 13,769.73

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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.