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Finding the Fourth Proportional to 20,907.59, 28,865.99 and 12,958.25

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Solution

The fourth proportional to 20,907.59, 28,865.99 and 12,958.25 is: 17,890.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,907.59 : 28,865.99 = 12,958.25 : x
  2. Step 2: Convert to fraction form
    20,907.59/28,865.99 = 12,958.25/x
  3. Step 3: Cross multiply
    20,907.59x = 28,865.99 × 12,958.25
  4. Step 4: Simplify right side
    20,907.59x = 374,052,714.92
  5. Step 5: Solve for x
    x = 374,052,714.92/20,907.59
  6. Step 6: Final answer
    x = 17,890.76

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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.