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Finding the Fourth Proportional to 423.31, 584.28 and 257.58

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Solution

The fourth proportional to 423.31, 584.28 and 257.58 is: 355.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.31 : 584.28 = 257.58 : x
  2. Step 2: Convert to fraction form
    423.31/584.28 = 257.58/x
  3. Step 3: Cross multiply
    423.31x = 584.28 × 257.58
  4. Step 4: Simplify right side
    423.31x = 150,495.28
  5. Step 5: Solve for x
    x = 150,495.28/423.31
  6. Step 6: Final answer
    x = 355.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.