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Finding the Fourth Proportional to 18,858.56, 28,295.40 and 7,770.74

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Solution

The fourth proportional to 18,858.56, 28,295.40 and 7,770.74 is: 11,659.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,858.56 : 28,295.40 = 7,770.74 : x
  2. Step 2: Convert to fraction form
    18,858.56/28,295.40 = 7,770.74/x
  3. Step 3: Cross multiply
    18,858.56x = 28,295.40 × 7,770.74
  4. Step 4: Simplify right side
    18,858.56x = 219,876,196.60
  5. Step 5: Solve for x
    x = 219,876,196.60/18,858.56
  6. Step 6: Final answer
    x = 11,659.23

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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.