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Finding the Fourth Proportional to 20,003.70, 30,009.15 and 8,318.10

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Solution

The fourth proportional to 20,003.70, 30,009.15 and 8,318.10 is: 12,478.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,003.70 : 30,009.15 = 8,318.10 : x
  2. Step 2: Convert to fraction form
    20,003.70/30,009.15 = 8,318.10/x
  3. Step 3: Cross multiply
    20,003.70x = 30,009.15 × 8,318.10
  4. Step 4: Simplify right side
    20,003.70x = 249,619,110.62
  5. Step 5: Solve for x
    x = 249,619,110.62/20,003.70
  6. Step 6: Final answer
    x = 12,478.65

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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.