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Finding the Fourth Proportional to 20,957.03, 28,921.06 and 12,005.32

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Solution

The fourth proportional to 20,957.03, 28,921.06 and 12,005.32 is: 16,567.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,957.03 : 28,921.06 = 12,005.32 : x
  2. Step 2: Convert to fraction form
    20,957.03/28,921.06 = 12,005.32/x
  3. Step 3: Cross multiply
    20,957.03x = 28,921.06 × 12,005.32
  4. Step 4: Simplify right side
    20,957.03x = 347,206,375.41
  5. Step 5: Solve for x
    x = 347,206,375.41/20,957.03
  6. Step 6: Final answer
    x = 16,567.54

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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.