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Finding the Fourth Proportional to 20,797.78, 28,702.10 and 13,719.20

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Solution

The fourth proportional to 20,797.78, 28,702.10 and 13,719.20 is: 18,933.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,797.78 : 28,702.10 = 13,719.20 : x
  2. Step 2: Convert to fraction form
    20,797.78/28,702.10 = 13,719.20/x
  3. Step 3: Cross multiply
    20,797.78x = 28,702.10 × 13,719.20
  4. Step 4: Simplify right side
    20,797.78x = 393,769,850.32
  5. Step 5: Solve for x
    x = 393,769,850.32/20,797.78
  6. Step 6: Final answer
    x = 18,933.26

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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.