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Finding the Fourth Proportional to 25,611.78, 38,405.43 and 13,137.78

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Solution

The fourth proportional to 25,611.78, 38,405.43 and 13,137.78 is: 19,700.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,611.78 : 38,405.43 = 13,137.78 : x
  2. Step 2: Convert to fraction form
    25,611.78/38,405.43 = 13,137.78/x
  3. Step 3: Cross multiply
    25,611.78x = 38,405.43 × 13,137.78
  4. Step 4: Simplify right side
    25,611.78x = 504,562,090.15
  5. Step 5: Solve for x
    x = 504,562,090.15/25,611.78
  6. Step 6: Final answer
    x = 19,700.39

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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.