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Finding the Fourth Proportional to 438.02, 656.66 and 255.54

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Solution

The fourth proportional to 438.02, 656.66 and 255.54 is: 383.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.02 : 656.66 = 255.54 : x
  2. Step 2: Convert to fraction form
    438.02/656.66 = 255.54/x
  3. Step 3: Cross multiply
    438.02x = 656.66 × 255.54
  4. Step 4: Simplify right side
    438.02x = 167,802.90
  5. Step 5: Solve for x
    x = 167,802.90/438.02
  6. Step 6: Final answer
    x = 383.09

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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.