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Finding the Fourth Proportional to 21,269.56, 31,918.62 and 8,789.56

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Solution

The fourth proportional to 21,269.56, 31,918.62 and 8,789.56 is: 13,190.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,269.56 : 31,918.62 = 8,789.56 : x
  2. Step 2: Convert to fraction form
    21,269.56/31,918.62 = 8,789.56/x
  3. Step 3: Cross multiply
    21,269.56x = 31,918.62 × 8,789.56
  4. Step 4: Simplify right side
    21,269.56x = 280,550,712.45
  5. Step 5: Solve for x
    x = 280,550,712.45/21,269.56
  6. Step 6: Final answer
    x = 13,190.25

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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.