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Finding the Fourth Proportional to 20,999.25, 28,976.13 and 12,045.11

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Solution

The fourth proportional to 20,999.25, 28,976.13 and 12,045.11 is: 16,620.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.25 : 28,976.13 = 12,045.11 : x
  2. Step 2: Convert to fraction form
    20,999.25/28,976.13 = 12,045.11/x
  3. Step 3: Cross multiply
    20,999.25x = 28,976.13 × 12,045.11
  4. Step 4: Simplify right side
    20,999.25x = 349,020,528.34
  5. Step 5: Solve for x
    x = 349,020,528.34/20,999.25
  6. Step 6: Final answer
    x = 16,620.62

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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.