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Finding the Fourth Proportional to 20,490.60, 30,745.65 and 7,344.30

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Solution

The fourth proportional to 20,490.60, 30,745.65 and 7,344.30 is: 11,019.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.60 : 30,745.65 = 7,344.30 : x
  2. Step 2: Convert to fraction form
    20,490.60/30,745.65 = 7,344.30/x
  3. Step 3: Cross multiply
    20,490.60x = 30,745.65 × 7,344.30
  4. Step 4: Simplify right side
    20,490.60x = 225,805,277.30
  5. Step 5: Solve for x
    x = 225,805,277.30/20,490.60
  6. Step 6: Final answer
    x = 11,019.94

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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.