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Finding the Fourth Proportional to 20,672.80, 28,980.80 and 20,672.80

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Solution

The fourth proportional to 20,672.80, 28,980.80 and 20,672.80 is: 28,980.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,672.80 : 28,980.80 = 20,672.80 : x
  2. Step 2: Convert to fraction form
    20,672.80/28,980.80 = 20,672.80/x
  3. Step 3: Cross multiply
    20,672.80x = 28,980.80 × 20,672.80
  4. Step 4: Simplify right side
    20,672.80x = 599,114,282.24
  5. Step 5: Solve for x
    x = 599,114,282.24/20,672.80
  6. Step 6: Final answer
    x = 28,980.80

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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.