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Finding the Fourth Proportional to 13,957.80, 20,979.90 and 13,698.60

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Solution

The fourth proportional to 13,957.80, 20,979.90 and 13,698.60 is: 20,590.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,957.80 : 20,979.90 = 13,698.60 : x
  2. Step 2: Convert to fraction form
    13,957.80/20,979.90 = 13,698.60/x
  3. Step 3: Cross multiply
    13,957.80x = 20,979.90 × 13,698.60
  4. Step 4: Simplify right side
    13,957.80x = 287,395,258.14
  5. Step 5: Solve for x
    x = 287,395,258.14/13,957.80
  6. Step 6: Final answer
    x = 20,590.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.