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Finding the Fourth Proportional to 12,455.57, 18,662.58 and 8,940.31

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Solution

The fourth proportional to 12,455.57, 18,662.58 and 8,940.31 is: 13,395.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,455.57 : 18,662.58 = 8,940.31 : x
  2. Step 2: Convert to fraction form
    12,455.57/18,662.58 = 8,940.31/x
  3. Step 3: Cross multiply
    12,455.57x = 18,662.58 × 8,940.31
  4. Step 4: Simplify right side
    12,455.57x = 166,849,157.29
  5. Step 5: Solve for x
    x = 166,849,157.29/12,455.57
  6. Step 6: Final answer
    x = 13,395.55

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1.5x scale

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.