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Finding the Fourth Proportional to 20,628, 28,470.24 and 12,244.32

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Solution

The fourth proportional to 20,628, 28,470.24 and 12,244.32 is: 16,899.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,628 : 28,470.24 = 12,244.32 : x
  2. Step 2: Convert to fraction form
    20,628/28,470.24 = 12,244.32/x
  3. Step 3: Cross multiply
    20,628x = 28,470.24 × 12,244.32
  4. Step 4: Simplify right side
    20,628x = 348,598,729.04
  5. Step 5: Solve for x
    x = 348,598,729.04/20,628
  6. Step 6: Final answer
    x = 16,899.30

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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.