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Finding the Fourth Proportional to 431.36, 646.08 and 238.56

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Solution

The fourth proportional to 431.36, 646.08 and 238.56 is: 357.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.36 : 646.08 = 238.56 : x
  2. Step 2: Convert to fraction form
    431.36/646.08 = 238.56/x
  3. Step 3: Cross multiply
    431.36x = 646.08 × 238.56
  4. Step 4: Simplify right side
    431.36x = 154,128.84
  5. Step 5: Solve for x
    x = 154,128.84/431.36
  6. Step 6: Final answer
    x = 357.31

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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.