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Finding the Fourth Proportional to 14,789.22, 20,405.22 and 8,415.87

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Solution

The fourth proportional to 14,789.22, 20,405.22 and 8,415.87 is: 11,611.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,789.22 : 20,405.22 = 8,415.87 : x
  2. Step 2: Convert to fraction form
    14,789.22/20,405.22 = 8,415.87/x
  3. Step 3: Cross multiply
    14,789.22x = 20,405.22 × 8,415.87
  4. Step 4: Simplify right side
    14,789.22x = 171,727,678.84
  5. Step 5: Solve for x
    x = 171,727,678.84/14,789.22
  6. Step 6: Final answer
    x = 11,611.68

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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.