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Finding the Fourth Proportional to 20,960.60, 28,912.94 and 12,895.60

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Solution

The fourth proportional to 20,960.60, 28,912.94 and 12,895.60 is: 17,788.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,960.60 : 28,912.94 = 12,895.60 : x
  2. Step 2: Convert to fraction form
    20,960.60/28,912.94 = 12,895.60/x
  3. Step 3: Cross multiply
    20,960.60x = 28,912.94 × 12,895.60
  4. Step 4: Simplify right side
    20,960.60x = 372,849,709.06
  5. Step 5: Solve for x
    x = 372,849,709.06/20,960.60
  6. Step 6: Final answer
    x = 17,788.12

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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.