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Finding the Fourth Proportional to 30,606.80, 45,845.40 and 20,109.20

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Solution

The fourth proportional to 30,606.80, 45,845.40 and 20,109.20 is: 30,121.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,606.80 : 45,845.40 = 20,109.20 : x
  2. Step 2: Convert to fraction form
    30,606.80/45,845.40 = 20,109.20/x
  3. Step 3: Cross multiply
    30,606.80x = 45,845.40 × 20,109.20
  4. Step 4: Simplify right side
    30,606.80x = 921,914,317.68
  5. Step 5: Solve for x
    x = 921,914,317.68/30,606.80
  6. Step 6: Final answer
    x = 30,121.23

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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.