Home / 20,798.72-28,702.96-12,840.80

Finding the Fourth Proportional to 20,798.72, 28,702.96 and 12,840.80

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Solution

The fourth proportional to 20,798.72, 28,702.96 and 12,840.80 is: 17,720.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,798.72 : 28,702.96 = 12,840.80 : x
  2. Step 2: Convert to fraction form
    20,798.72/28,702.96 = 12,840.80/x
  3. Step 3: Cross multiply
    20,798.72x = 28,702.96 × 12,840.80
  4. Step 4: Simplify right side
    20,798.72x = 368,568,968.77
  5. Step 5: Solve for x
    x = 368,568,968.77/20,798.72
  6. Step 6: Final answer
    x = 17,720.75

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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.