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Finding the Fourth Proportional to 20,573.34, 30,860 and 4,990.96

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Solution

The fourth proportional to 20,573.34, 30,860 and 4,990.96 is: 7,486.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,573.34 : 30,860 = 4,990.96 : x
  2. Step 2: Convert to fraction form
    20,573.34/30,860 = 4,990.96/x
  3. Step 3: Cross multiply
    20,573.34x = 30,860 × 4,990.96
  4. Step 4: Simplify right side
    20,573.34x = 154,021,025.60
  5. Step 5: Solve for x
    x = 154,021,025.60/20,573.34
  6. Step 6: Final answer
    x = 7,486.44

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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.