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Finding the Fourth Proportional to 18,969.63, 28,451.94 and 5,820.90

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Solution

The fourth proportional to 18,969.63, 28,451.94 and 5,820.90 is: 8,730.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,969.63 : 28,451.94 = 5,820.90 : x
  2. Step 2: Convert to fraction form
    18,969.63/28,451.94 = 5,820.90/x
  3. Step 3: Cross multiply
    18,969.63x = 28,451.94 × 5,820.90
  4. Step 4: Simplify right side
    18,969.63x = 165,615,912.10
  5. Step 5: Solve for x
    x = 165,615,912.10/18,969.63
  6. Step 6: Final answer
    x = 8,730.58

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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.