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Finding the Fourth Proportional to 20,728.55, 28,604.03 and 11,655.30

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Solution

The fourth proportional to 20,728.55, 28,604.03 and 11,655.30 is: 16,083.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,728.55 : 28,604.03 = 11,655.30 : x
  2. Step 2: Convert to fraction form
    20,728.55/28,604.03 = 11,655.30/x
  3. Step 3: Cross multiply
    20,728.55x = 28,604.03 × 11,655.30
  4. Step 4: Simplify right side
    20,728.55x = 333,388,492.58
  5. Step 5: Solve for x
    x = 333,388,492.58/20,728.55
  6. Step 6: Final answer
    x = 16,083.55

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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.