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Finding the Fourth Proportional to 20,425.38, 30,639.96 and 7,946.34

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Solution

The fourth proportional to 20,425.38, 30,639.96 and 7,946.34 is: 11,920.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,425.38 : 30,639.96 = 7,946.34 : x
  2. Step 2: Convert to fraction form
    20,425.38/30,639.96 = 7,946.34/x
  3. Step 3: Cross multiply
    20,425.38x = 30,639.96 × 7,946.34
  4. Step 4: Simplify right side
    20,425.38x = 243,475,539.75
  5. Step 5: Solve for x
    x = 243,475,539.75/20,425.38
  6. Step 6: Final answer
    x = 11,920.25

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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.