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Finding the Fourth Proportional to 431.33, 646.02 and 257.66

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Solution

The fourth proportional to 431.33, 646.02 and 257.66 is: 385.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.33 : 646.02 = 257.66 : x
  2. Step 2: Convert to fraction form
    431.33/646.02 = 257.66/x
  3. Step 3: Cross multiply
    431.33x = 646.02 × 257.66
  4. Step 4: Simplify right side
    431.33x = 166,450.28
  5. Step 5: Solve for x
    x = 166,450.28/431.33
  6. Step 6: Final answer
    x = 385.90

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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.