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Finding the Fourth Proportional to 86,991.56, 130,289.28 and 51,858.62

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Solution

The fourth proportional to 86,991.56, 130,289.28 and 51,858.62 is: 77,669.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,991.56 : 130,289.28 = 51,858.62 : x
  2. Step 2: Convert to fraction form
    86,991.56/130,289.28 = 51,858.62/x
  3. Step 3: Cross multiply
    86,991.56x = 130,289.28 × 51,858.62
  4. Step 4: Simplify right side
    86,991.56x = 6,756,622,261.59
  5. Step 5: Solve for x
    x = 6,756,622,261.59/86,991.56
  6. Step 6: Final answer
    x = 77,669.86

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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.