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Finding the Fourth Proportional to 438.96, 657.58 and 255.97

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Solution

The fourth proportional to 438.96, 657.58 and 255.97 is: 383.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.96 : 657.58 = 255.97 : x
  2. Step 2: Convert to fraction form
    438.96/657.58 = 255.97/x
  3. Step 3: Cross multiply
    438.96x = 657.58 × 255.97
  4. Step 4: Simplify right side
    438.96x = 168,320.75
  5. Step 5: Solve for x
    x = 168,320.75/438.96
  6. Step 6: Final answer
    x = 383.45

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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.