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Finding the Fourth Proportional to 318,057.76, 438,923.06 and 172,863.51

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Solution

The fourth proportional to 318,057.76, 438,923.06 and 172,863.51 is: 238,553.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,057.76 : 438,923.06 = 172,863.51 : x
  2. Step 2: Convert to fraction form
    318,057.76/438,923.06 = 172,863.51/x
  3. Step 3: Cross multiply
    318,057.76x = 438,923.06 × 172,863.51
  4. Step 4: Simplify right side
    318,057.76x = 75,873,780,771.54
  5. Step 5: Solve for x
    x = 75,873,780,771.54/318,057.76
  6. Step 6: Final answer
    x = 238,553.47

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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.