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Finding the Fourth Proportional to 657.21, 985.83 and 170.31

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Solution

The fourth proportional to 657.21, 985.83 and 170.31 is: 255.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.21 : 985.83 = 170.31 : x
  2. Step 2: Convert to fraction form
    657.21/985.83 = 170.31/x
  3. Step 3: Cross multiply
    657.21x = 985.83 × 170.31
  4. Step 4: Simplify right side
    657.21x = 167,896.71
  5. Step 5: Solve for x
    x = 167,896.71/657.21
  6. Step 6: Final answer
    x = 255.47

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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.