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Finding the Fourth Proportional to 12,379.70, 18,569.55 and 7,446.80

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Solution

The fourth proportional to 12,379.70, 18,569.55 and 7,446.80 is: 11,170.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,379.70 : 18,569.55 = 7,446.80 : x
  2. Step 2: Convert to fraction form
    12,379.70/18,569.55 = 7,446.80/x
  3. Step 3: Cross multiply
    12,379.70x = 18,569.55 × 7,446.80
  4. Step 4: Simplify right side
    12,379.70x = 138,283,724.94
  5. Step 5: Solve for x
    x = 138,283,724.94/12,379.70
  6. Step 6: Final answer
    x = 11,170.20

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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.