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Finding the Fourth Proportional to 86,019.36, 128,825.44 and 43,795.68

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Solution

The fourth proportional to 86,019.36, 128,825.44 and 43,795.68 is: 65,589.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,019.36 : 128,825.44 = 43,795.68 : x
  2. Step 2: Convert to fraction form
    86,019.36/128,825.44 = 43,795.68/x
  3. Step 3: Cross multiply
    86,019.36x = 128,825.44 × 43,795.68
  4. Step 4: Simplify right side
    86,019.36x = 5,641,997,746.10
  5. Step 5: Solve for x
    x = 5,641,997,746.10/86,019.36
  6. Step 6: Final answer
    x = 65,589.86

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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.