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Finding the Fourth Proportional to 20,992.92, 28,970.23 and 11,561.48

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Solution

The fourth proportional to 20,992.92, 28,970.23 and 11,561.48 is: 15,954.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,992.92 : 28,970.23 = 11,561.48 : x
  2. Step 2: Convert to fraction form
    20,992.92/28,970.23 = 11,561.48/x
  3. Step 3: Cross multiply
    20,992.92x = 28,970.23 × 11,561.48
  4. Step 4: Simplify right side
    20,992.92x = 334,938,886.78
  5. Step 5: Solve for x
    x = 334,938,886.78/20,992.92
  6. Step 6: Final answer
    x = 15,954.85

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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.