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Finding the Fourth Proportional to 18,766.63, 28,118.80 and 13,208.29

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Solution

The fourth proportional to 18,766.63, 28,118.80 and 13,208.29 is: 19,790.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,766.63 : 28,118.80 = 13,208.29 : x
  2. Step 2: Convert to fraction form
    18,766.63/28,118.80 = 13,208.29/x
  3. Step 3: Cross multiply
    18,766.63x = 28,118.80 × 13,208.29
  4. Step 4: Simplify right side
    18,766.63x = 371,401,334.48
  5. Step 5: Solve for x
    x = 371,401,334.48/18,766.63
  6. Step 6: Final answer
    x = 19,790.52

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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.