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Finding the Fourth Proportional to 170,057.70, 255,090.75 and 81,320.58

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Solution

The fourth proportional to 170,057.70, 255,090.75 and 81,320.58 is: 121,982.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,057.70 : 255,090.75 = 81,320.58 : x
  2. Step 2: Convert to fraction form
    170,057.70/255,090.75 = 81,320.58/x
  3. Step 3: Cross multiply
    170,057.70x = 255,090.75 × 81,320.58
  4. Step 4: Simplify right side
    170,057.70x = 20,744,127,742.64
  5. Step 5: Solve for x
    x = 20,744,127,742.64/170,057.70
  6. Step 6: Final answer
    x = 121,982.88

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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.