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Finding the Fourth Proportional to 86,405.79, 129,626.22 and 36,485.69

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Solution

The fourth proportional to 86,405.79, 129,626.22 and 36,485.69 is: 54,735.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,405.79 : 129,626.22 = 36,485.69 : x
  2. Step 2: Convert to fraction form
    86,405.79/129,626.22 = 36,485.69/x
  3. Step 3: Cross multiply
    86,405.79x = 129,626.22 × 36,485.69
  4. Step 4: Simplify right side
    86,405.79x = 4,729,502,296.63
  5. Step 5: Solve for x
    x = 4,729,502,296.63/86,405.79
  6. Step 6: Final answer
    x = 54,735.94

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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.