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Finding the Fourth Proportional to 20,485.84, 30,731.46 and 7,339.72

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Solution

The fourth proportional to 20,485.84, 30,731.46 and 7,339.72 is: 11,010.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,485.84 : 30,731.46 = 7,339.72 : x
  2. Step 2: Convert to fraction form
    20,485.84/30,731.46 = 7,339.72/x
  3. Step 3: Cross multiply
    20,485.84x = 30,731.46 × 7,339.72
  4. Step 4: Simplify right side
    20,485.84x = 225,560,311.59
  5. Step 5: Solve for x
    x = 225,560,311.59/20,485.84
  6. Step 6: Final answer
    x = 11,010.55

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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.