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Finding the Fourth Proportional to 28,709.70, 43,076.70 and 18,187.80

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Solution

The fourth proportional to 28,709.70, 43,076.70 and 18,187.80 is: 27,289.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,709.70 : 43,076.70 = 18,187.80 : x
  2. Step 2: Convert to fraction form
    28,709.70/43,076.70 = 18,187.80/x
  3. Step 3: Cross multiply
    28,709.70x = 43,076.70 × 18,187.80
  4. Step 4: Simplify right side
    28,709.70x = 783,470,404.26
  5. Step 5: Solve for x
    x = 783,470,404.26/28,709.70
  6. Step 6: Final answer
    x = 27,289.40

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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.