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Finding the Fourth Proportional to 13,611.77, 20,420.06 and 6,216.98

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Solution

The fourth proportional to 13,611.77, 20,420.06 and 6,216.98 is: 9,326.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,611.77 : 20,420.06 = 6,216.98 : x
  2. Step 2: Convert to fraction form
    13,611.77/20,420.06 = 6,216.98/x
  3. Step 3: Cross multiply
    13,611.77x = 20,420.06 × 6,216.98
  4. Step 4: Simplify right side
    13,611.77x = 126,950,971.43
  5. Step 5: Solve for x
    x = 126,950,971.43/13,611.77
  6. Step 6: Final answer
    x = 9,326.56

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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.