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Finding the Fourth Proportional to 20,422.56, 30,636 and 7,276.32

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Solution

The fourth proportional to 20,422.56, 30,636 and 7,276.32 is: 10,915.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,422.56 : 30,636 = 7,276.32 : x
  2. Step 2: Convert to fraction form
    20,422.56/30,636 = 7,276.32/x
  3. Step 3: Cross multiply
    20,422.56x = 30,636 × 7,276.32
  4. Step 4: Simplify right side
    20,422.56x = 222,917,339.52
  5. Step 5: Solve for x
    x = 222,917,339.52/20,422.56
  6. Step 6: Final answer
    x = 10,915.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.