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Finding the Fourth Proportional to 12,479.87, 18,675.77 and 11,769.40

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Solution

The fourth proportional to 12,479.87, 18,675.77 and 11,769.40 is: 17,612.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,479.87 : 18,675.77 = 11,769.40 : x
  2. Step 2: Convert to fraction form
    12,479.87/18,675.77 = 11,769.40/x
  3. Step 3: Cross multiply
    12,479.87x = 18,675.77 × 11,769.40
  4. Step 4: Simplify right side
    12,479.87x = 219,802,571.94
  5. Step 5: Solve for x
    x = 219,802,571.94/12,479.87
  6. Step 6: Final answer
    x = 17,612.57

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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.