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Finding the Fourth Proportional to 86,813.73, 130,871.28 and 81,027.05

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Solution

The fourth proportional to 86,813.73, 130,871.28 and 81,027.05 is: 122,147.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,813.73 : 130,871.28 = 81,027.05 : x
  2. Step 2: Convert to fraction form
    86,813.73/130,871.28 = 81,027.05/x
  3. Step 3: Cross multiply
    86,813.73x = 130,871.28 × 81,027.05
  4. Step 4: Simplify right side
    86,813.73x = 10,604,112,941.84
  5. Step 5: Solve for x
    x = 10,604,112,941.84/86,813.73
  6. Step 6: Final answer
    x = 122,147.88

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.