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Finding the Fourth Proportional to 14,361.21, 19,815.60 and 8,391.72

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Solution

The fourth proportional to 14,361.21, 19,815.60 and 8,391.72 is: 11,578.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,361.21 : 19,815.60 = 8,391.72 : x
  2. Step 2: Convert to fraction form
    14,361.21/19,815.60 = 8,391.72/x
  3. Step 3: Cross multiply
    14,361.21x = 19,815.60 × 8,391.72
  4. Step 4: Simplify right side
    14,361.21x = 166,286,966.83
  5. Step 5: Solve for x
    x = 166,286,966.83/14,361.21
  6. Step 6: Final answer
    x = 11,578.90

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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.