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Finding the Fourth Proportional to 21,420, 32,130 and 9,108

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Solution

The fourth proportional to 21,420, 32,130 and 9,108 is: 13,662

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,420 : 32,130 = 9,108 : x
  2. Step 2: Convert to fraction form
    21,420/32,130 = 9,108/x
  3. Step 3: Cross multiply
    21,420x = 32,130 × 9,108
  4. Step 4: Simplify right side
    21,420x = 292,640,040
  5. Step 5: Solve for x
    x = 292,640,040/21,420
  6. Step 6: Final answer
    x = 13,662

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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.