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Finding the Fourth Proportional to 20,957.88, 28,933.86 and 13,893.90

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Solution

The fourth proportional to 20,957.88, 28,933.86 and 13,893.90 is: 19,181.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,957.88 : 28,933.86 = 13,893.90 : x
  2. Step 2: Convert to fraction form
    20,957.88/28,933.86 = 13,893.90/x
  3. Step 3: Cross multiply
    20,957.88x = 28,933.86 × 13,893.90
  4. Step 4: Simplify right side
    20,957.88x = 402,004,157.45
  5. Step 5: Solve for x
    x = 402,004,157.45/20,957.88
  6. Step 6: Final answer
    x = 19,181.53

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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.