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Finding the Fourth Proportional to 12,290.56, 18,423.84 and 5,721.28

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Solution

The fourth proportional to 12,290.56, 18,423.84 and 5,721.28 is: 8,576.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,290.56 : 18,423.84 = 5,721.28 : x
  2. Step 2: Convert to fraction form
    12,290.56/18,423.84 = 5,721.28/x
  3. Step 3: Cross multiply
    12,290.56x = 18,423.84 × 5,721.28
  4. Step 4: Simplify right side
    12,290.56x = 105,407,947.32
  5. Step 5: Solve for x
    x = 105,407,947.32/12,290.56
  6. Step 6: Final answer
    x = 8,576.33

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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.