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Finding the Fourth Proportional to 20,672.90, 28,993.90 and 20,672.90

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Solution

The fourth proportional to 20,672.90, 28,993.90 and 20,672.90 is: 28,993.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,672.90 : 28,993.90 = 20,672.90 : x
  2. Step 2: Convert to fraction form
    20,672.90/28,993.90 = 20,672.90/x
  3. Step 3: Cross multiply
    20,672.90x = 28,993.90 × 20,672.90
  4. Step 4: Simplify right side
    20,672.90x = 599,387,995.31
  5. Step 5: Solve for x
    x = 599,387,995.31/20,672.90
  6. Step 6: Final answer
    x = 28,993.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.