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Finding the Fourth Proportional to 13,611.54, 18,783.90 and 7,643.79

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Solution

The fourth proportional to 13,611.54, 18,783.90 and 7,643.79 is: 10,548.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,611.54 : 18,783.90 = 7,643.79 : x
  2. Step 2: Convert to fraction form
    13,611.54/18,783.90 = 7,643.79/x
  3. Step 3: Cross multiply
    13,611.54x = 18,783.90 × 7,643.79
  4. Step 4: Simplify right side
    13,611.54x = 143,580,186.98
  5. Step 5: Solve for x
    x = 143,580,186.98/13,611.54
  6. Step 6: Final answer
    x = 10,548.42

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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.