Home / 13,611.20-18,783.45-7,644.78

Finding the Fourth Proportional to 13,611.20, 18,783.45 and 7,644.78

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Solution

The fourth proportional to 13,611.20, 18,783.45 and 7,644.78 is: 10,549.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,611.20 : 18,783.45 = 7,644.78 : x
  2. Step 2: Convert to fraction form
    13,611.20/18,783.45 = 7,644.78/x
  3. Step 3: Cross multiply
    13,611.20x = 18,783.45 × 7,644.78
  4. Step 4: Simplify right side
    13,611.20x = 143,595,342.89
  5. Step 5: Solve for x
    x = 143,595,342.89/13,611.20
  6. Step 6: Final answer
    x = 10,549.80

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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.