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Finding the Fourth Proportional to 123,856.66, 170,922.52 and 72,871.31

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Solution

The fourth proportional to 123,856.66, 170,922.52 and 72,871.31 is: 100,562.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,856.66 : 170,922.52 = 72,871.31 : x
  2. Step 2: Convert to fraction form
    123,856.66/170,922.52 = 72,871.31/x
  3. Step 3: Cross multiply
    123,856.66x = 170,922.52 × 72,871.31
  4. Step 4: Simplify right side
    123,856.66x = 12,455,347,087.96
  5. Step 5: Solve for x
    x = 12,455,347,087.96/123,856.66
  6. Step 6: Final answer
    x = 100,562.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.