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Finding the Fourth Proportional to 20,670, 31,005 and 6,820.08

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Solution

The fourth proportional to 20,670, 31,005 and 6,820.08 is: 10,230.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,670 : 31,005 = 6,820.08 : x
  2. Step 2: Convert to fraction form
    20,670/31,005 = 6,820.08/x
  3. Step 3: Cross multiply
    20,670x = 31,005 × 6,820.08
  4. Step 4: Simplify right side
    20,670x = 211,456,580.40
  5. Step 5: Solve for x
    x = 211,456,580.40/20,670
  6. Step 6: Final answer
    x = 10,230.12

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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.