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Finding the Fourth Proportional to 12,379.79, 18,578.87 and 7,706.59

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Solution

The fourth proportional to 12,379.79, 18,578.87 and 7,706.59 is: 11,565.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,379.79 : 18,578.87 = 7,706.59 : x
  2. Step 2: Convert to fraction form
    12,379.79/18,578.87 = 7,706.59/x
  3. Step 3: Cross multiply
    12,379.79x = 18,578.87 × 7,706.59
  4. Step 4: Simplify right side
    12,379.79x = 143,179,782.18
  5. Step 5: Solve for x
    x = 143,179,782.18/12,379.79
  6. Step 6: Final answer
    x = 11,565.61

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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.