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Finding the Fourth Proportional to 86,404, 129,606 and 20,740

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Solution

The fourth proportional to 86,404, 129,606 and 20,740 is: 31,110

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,404 : 129,606 = 20,740 : x
  2. Step 2: Convert to fraction form
    86,404/129,606 = 20,740/x
  3. Step 3: Cross multiply
    86,404x = 129,606 × 20,740
  4. Step 4: Simplify right side
    86,404x = 2,688,028,440
  5. Step 5: Solve for x
    x = 2,688,028,440/86,404
  6. Step 6: Final answer
    x = 31,110

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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.