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Finding the Fourth Proportional to 171,388.65, 257,135.49 and 76,698.54

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Solution

The fourth proportional to 171,388.65, 257,135.49 and 76,698.54 is: 115,071.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,388.65 : 257,135.49 = 76,698.54 : x
  2. Step 2: Convert to fraction form
    171,388.65/257,135.49 = 76,698.54/x
  3. Step 3: Cross multiply
    171,388.65x = 257,135.49 × 76,698.54
  4. Step 4: Simplify right side
    171,388.65x = 19,721,916,665.18
  5. Step 5: Solve for x
    x = 19,721,916,665.18/171,388.65
  6. Step 6: Final answer
    x = 115,071.31

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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.