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Finding the Fourth Proportional to 30,291.52, 41,815.20 and 20,361.28

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Solution

The fourth proportional to 30,291.52, 41,815.20 and 20,361.28 is: 28,107.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,291.52 : 41,815.20 = 20,361.28 : x
  2. Step 2: Convert to fraction form
    30,291.52/41,815.20 = 20,361.28/x
  3. Step 3: Cross multiply
    30,291.52x = 41,815.20 × 20,361.28
  4. Step 4: Simplify right side
    30,291.52x = 851,410,995.46
  5. Step 5: Solve for x
    x = 851,410,995.46/30,291.52
  6. Step 6: Final answer
    x = 28,107.24

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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.