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Finding the Fourth Proportional to 353.54, 530.31 and 257.06

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Solution

The fourth proportional to 353.54, 530.31 and 257.06 is: 385.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.54 : 530.31 = 257.06 : x
  2. Step 2: Convert to fraction form
    353.54/530.31 = 257.06/x
  3. Step 3: Cross multiply
    353.54x = 530.31 × 257.06
  4. Step 4: Simplify right side
    353.54x = 136,321.49
  5. Step 5: Solve for x
    x = 136,321.49/353.54
  6. Step 6: Final answer
    x = 385.59

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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.