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Finding the Fourth Proportional to 86,556, 129,834 and 20,892

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Solution

The fourth proportional to 86,556, 129,834 and 20,892 is: 31,338

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,556 : 129,834 = 20,892 : x
  2. Step 2: Convert to fraction form
    86,556/129,834 = 20,892/x
  3. Step 3: Cross multiply
    86,556x = 129,834 × 20,892
  4. Step 4: Simplify right side
    86,556x = 2,712,491,928
  5. Step 5: Solve for x
    x = 2,712,491,928/86,556
  6. Step 6: Final answer
    x = 31,338

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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.