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Finding the Fourth Proportional to 28,608.40, 42,873.10 and 20,647.45

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Solution

The fourth proportional to 28,608.40, 42,873.10 and 20,647.45 is: 30,942.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,608.40 : 42,873.10 = 20,647.45 : x
  2. Step 2: Convert to fraction form
    28,608.40/42,873.10 = 20,647.45/x
  3. Step 3: Cross multiply
    28,608.40x = 42,873.10 × 20,647.45
  4. Step 4: Simplify right side
    28,608.40x = 885,220,188.60
  5. Step 5: Solve for x
    x = 885,220,188.60/28,608.40
  6. Step 6: Final answer
    x = 30,942.67

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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.