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Finding the Fourth Proportional to 20,639.68, 30,945.76 and 7,490.34

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Solution

The fourth proportional to 20,639.68, 30,945.76 and 7,490.34 is: 11,230.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,639.68 : 30,945.76 = 7,490.34 : x
  2. Step 2: Convert to fraction form
    20,639.68/30,945.76 = 7,490.34/x
  3. Step 3: Cross multiply
    20,639.68x = 30,945.76 × 7,490.34
  4. Step 4: Simplify right side
    20,639.68x = 231,794,263.96
  5. Step 5: Solve for x
    x = 231,794,263.96/20,639.68
  6. Step 6: Final answer
    x = 11,230.52

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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.