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Finding the Fourth Proportional to 86,772, 130,158 and 21,108

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Solution

The fourth proportional to 86,772, 130,158 and 21,108 is: 31,662

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,772 : 130,158 = 21,108 : x
  2. Step 2: Convert to fraction form
    86,772/130,158 = 21,108/x
  3. Step 3: Cross multiply
    86,772x = 130,158 × 21,108
  4. Step 4: Simplify right side
    86,772x = 2,747,375,064
  5. Step 5: Solve for x
    x = 2,747,375,064/86,772
  6. Step 6: Final answer
    x = 31,662

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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.