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Finding the Fourth Proportional to 20,484.78, 30,693.93 and 7,990.68

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Solution

The fourth proportional to 20,484.78, 30,693.93 and 7,990.68 is: 11,973.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,484.78 : 30,693.93 = 7,990.68 : x
  2. Step 2: Convert to fraction form
    20,484.78/30,693.93 = 7,990.68/x
  3. Step 3: Cross multiply
    20,484.78x = 30,693.93 × 7,990.68
  4. Step 4: Simplify right side
    20,484.78x = 245,265,372.57
  5. Step 5: Solve for x
    x = 245,265,372.57/20,484.78
  6. Step 6: Final answer
    x = 11,973.05

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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.