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Finding the Fourth Proportional to 411.48, 617.34 and 257.64

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Solution

The fourth proportional to 411.48, 617.34 and 257.64 is: 386.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.48 : 617.34 = 257.64 : x
  2. Step 2: Convert to fraction form
    411.48/617.34 = 257.64/x
  3. Step 3: Cross multiply
    411.48x = 617.34 × 257.64
  4. Step 4: Simplify right side
    411.48x = 159,051.48
  5. Step 5: Solve for x
    x = 159,051.48/411.48
  6. Step 6: Final answer
    x = 386.54

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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.