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Finding the Fourth Proportional to 170,861.60, 256,365.30 and 82,069.40

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Solution

The fourth proportional to 170,861.60, 256,365.30 and 82,069.40 is: 123,139.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,861.60 : 256,365.30 = 82,069.40 : x
  2. Step 2: Convert to fraction form
    170,861.60/256,365.30 = 82,069.40/x
  3. Step 3: Cross multiply
    170,861.60x = 256,365.30 × 82,069.40
  4. Step 4: Simplify right side
    170,861.60x = 21,039,746,351.82
  5. Step 5: Solve for x
    x = 21,039,746,351.82/170,861.60
  6. Step 6: Final answer
    x = 123,139.12

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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.