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Finding the Fourth Proportional to 86,405.72, 129,626.67 and 36,485.96

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Solution

The fourth proportional to 86,405.72, 129,626.67 and 36,485.96 is: 54,736.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,405.72 : 129,626.67 = 36,485.96 : x
  2. Step 2: Convert to fraction form
    86,405.72/129,626.67 = 36,485.96/x
  3. Step 3: Cross multiply
    86,405.72x = 129,626.67 × 36,485.96
  4. Step 4: Simplify right side
    86,405.72x = 4,729,553,496.55
  5. Step 5: Solve for x
    x = 4,729,553,496.55/86,405.72
  6. Step 6: Final answer
    x = 54,736.58

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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.