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Finding the Fourth Proportional to 18,703.93, 25,811.41 and 11,989.55

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Solution

The fourth proportional to 18,703.93, 25,811.41 and 11,989.55 is: 16,545.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,703.93 : 25,811.41 = 11,989.55 : x
  2. Step 2: Convert to fraction form
    18,703.93/25,811.41 = 11,989.55/x
  3. Step 3: Cross multiply
    18,703.93x = 25,811.41 × 11,989.55
  4. Step 4: Simplify right side
    18,703.93x = 309,467,225.32
  5. Step 5: Solve for x
    x = 309,467,225.32/18,703.93
  6. Step 6: Final answer
    x = 16,545.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.