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Finding the Fourth Proportional to 86,808, 130,212 and 21,144

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Solution

The fourth proportional to 86,808, 130,212 and 21,144 is: 31,716

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,808 : 130,212 = 21,144 : x
  2. Step 2: Convert to fraction form
    86,808/130,212 = 21,144/x
  3. Step 3: Cross multiply
    86,808x = 130,212 × 21,144
  4. Step 4: Simplify right side
    86,808x = 2,753,202,528
  5. Step 5: Solve for x
    x = 2,753,202,528/86,808
  6. Step 6: Final answer
    x = 31,716

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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.