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Finding the Fourth Proportional to 20,798.80, 28,702.96 and 11,367.68

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Solution

The fourth proportional to 20,798.80, 28,702.96 and 11,367.68 is: 15,687.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,798.80 : 28,702.96 = 11,367.68 : x
  2. Step 2: Convert to fraction form
    20,798.80/28,702.96 = 11,367.68/x
  3. Step 3: Cross multiply
    20,798.80x = 28,702.96 × 11,367.68
  4. Step 4: Simplify right side
    20,798.80x = 326,286,064.33
  5. Step 5: Solve for x
    x = 326,286,064.33/20,798.80
  6. Step 6: Final answer
    x = 15,687.74

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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.