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Finding the Fourth Proportional to 20,940.77, 28,905.01 and 13,407.39

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Solution

The fourth proportional to 20,940.77, 28,905.01 and 13,407.39 is: 18,506.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,940.77 : 28,905.01 = 13,407.39 : x
  2. Step 2: Convert to fraction form
    20,940.77/28,905.01 = 13,407.39/x
  3. Step 3: Cross multiply
    20,940.77x = 28,905.01 × 13,407.39
  4. Step 4: Simplify right side
    20,940.77x = 387,540,742.02
  5. Step 5: Solve for x
    x = 387,540,742.02/20,940.77
  6. Step 6: Final answer
    x = 18,506.52

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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.