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Finding the Fourth Proportional to 438.27, 657.59 and 255.80

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Solution

The fourth proportional to 438.27, 657.59 and 255.80 is: 383.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.27 : 657.59 = 255.80 : x
  2. Step 2: Convert to fraction form
    438.27/657.59 = 255.80/x
  3. Step 3: Cross multiply
    438.27x = 657.59 × 255.80
  4. Step 4: Simplify right side
    438.27x = 168,206.96
  5. Step 5: Solve for x
    x = 168,206.96/438.27
  6. Step 6: Final answer
    x = 383.80

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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.