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Finding the Fourth Proportional to 20,994.56, 28,971.24 and 12,497.30

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Solution

The fourth proportional to 20,994.56, 28,971.24 and 12,497.30 is: 17,245.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,994.56 : 28,971.24 = 12,497.30 : x
  2. Step 2: Convert to fraction form
    20,994.56/28,971.24 = 12,497.30/x
  3. Step 3: Cross multiply
    20,994.56x = 28,971.24 × 12,497.30
  4. Step 4: Simplify right side
    20,994.56x = 362,062,277.65
  5. Step 5: Solve for x
    x = 362,062,277.65/20,994.56
  6. Step 6: Final answer
    x = 17,245.53

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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.