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Finding the Fourth Proportional to 424.78, 637.07 and 205.27

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Solution

The fourth proportional to 424.78, 637.07 and 205.27 is: 307.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.78 : 637.07 = 205.27 : x
  2. Step 2: Convert to fraction form
    424.78/637.07 = 205.27/x
  3. Step 3: Cross multiply
    424.78x = 637.07 × 205.27
  4. Step 4: Simplify right side
    424.78x = 130,771.36
  5. Step 5: Solve for x
    x = 130,771.36/424.78
  6. Step 6: Final answer
    x = 307.86

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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.