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Finding the Fourth Proportional to 21,220, 31,830 and 6,628

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Solution

The fourth proportional to 21,220, 31,830 and 6,628 is: 9,942

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,220 : 31,830 = 6,628 : x
  2. Step 2: Convert to fraction form
    21,220/31,830 = 6,628/x
  3. Step 3: Cross multiply
    21,220x = 31,830 × 6,628
  4. Step 4: Simplify right side
    21,220x = 210,969,240
  5. Step 5: Solve for x
    x = 210,969,240/21,220
  6. Step 6: Final answer
    x = 9,942

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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.