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Finding the Fourth Proportional to 18,744.60, 28,116.90 and 7,647.60

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Solution

The fourth proportional to 18,744.60, 28,116.90 and 7,647.60 is: 11,471.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,744.60 : 28,116.90 = 7,647.60 : x
  2. Step 2: Convert to fraction form
    18,744.60/28,116.90 = 7,647.60/x
  3. Step 3: Cross multiply
    18,744.60x = 28,116.90 × 7,647.60
  4. Step 4: Simplify right side
    18,744.60x = 215,026,804.44
  5. Step 5: Solve for x
    x = 215,026,804.44/18,744.60
  6. Step 6: Final answer
    x = 11,471.40

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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.