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Finding the Fourth Proportional to 20,992.78, 28,969.95 and 11,561.34

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Solution

The fourth proportional to 20,992.78, 28,969.95 and 11,561.34 is: 15,954.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,992.78 : 28,969.95 = 11,561.34 : x
  2. Step 2: Convert to fraction form
    20,992.78/28,969.95 = 11,561.34/x
  3. Step 3: Cross multiply
    20,992.78x = 28,969.95 × 11,561.34
  4. Step 4: Simplify right side
    20,992.78x = 334,931,441.73
  5. Step 5: Solve for x
    x = 334,931,441.73/20,992.78
  6. Step 6: Final answer
    x = 15,954.60

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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.