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Finding the Fourth Proportional to 20,403.60, 30,605.60 and 6,172.19

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Solution

The fourth proportional to 20,403.60, 30,605.60 and 6,172.19 is: 9,258.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,403.60 : 30,605.60 = 6,172.19 : x
  2. Step 2: Convert to fraction form
    20,403.60/30,605.60 = 6,172.19/x
  3. Step 3: Cross multiply
    20,403.60x = 30,605.60 × 6,172.19
  4. Step 4: Simplify right side
    20,403.60x = 188,903,532.29
  5. Step 5: Solve for x
    x = 188,903,532.29/20,403.60
  6. Step 6: Final answer
    x = 9,258.34

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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.