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Finding the Fourth Proportional to 86,007.79, 128,952.81 and 43,806.18

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Solution

The fourth proportional to 86,007.79, 128,952.81 and 43,806.18 is: 65,679.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,007.79 : 128,952.81 = 43,806.18 : x
  2. Step 2: Convert to fraction form
    86,007.79/128,952.81 = 43,806.18/x
  3. Step 3: Cross multiply
    86,007.79x = 128,952.81 × 43,806.18
  4. Step 4: Simplify right side
    86,007.79x = 5,648,930,489.94
  5. Step 5: Solve for x
    x = 5,648,930,489.94/86,007.79
  6. Step 6: Final answer
    x = 65,679.29

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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.