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Finding the Fourth Proportional to 18,978.04, 28,475.98 and 11,956.44

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Solution

The fourth proportional to 18,978.04, 28,475.98 and 11,956.44 is: 17,940.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.04 : 28,475.98 = 11,956.44 : x
  2. Step 2: Convert to fraction form
    18,978.04/28,475.98 = 11,956.44/x
  3. Step 3: Cross multiply
    18,978.04x = 28,475.98 × 11,956.44
  4. Step 4: Simplify right side
    18,978.04x = 340,471,346.31
  5. Step 5: Solve for x
    x = 340,471,346.31/18,978.04
  6. Step 6: Final answer
    x = 17,940.28

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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.