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Finding the Fourth Proportional to 354.10, 531.30 and 171.40

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Solution

The fourth proportional to 354.10, 531.30 and 171.40 is: 257.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.10 : 531.30 = 171.40 : x
  2. Step 2: Convert to fraction form
    354.10/531.30 = 171.40/x
  3. Step 3: Cross multiply
    354.10x = 531.30 × 171.40
  4. Step 4: Simplify right side
    354.10x = 91,064.82
  5. Step 5: Solve for x
    x = 91,064.82/354.10
  6. Step 6: Final answer
    x = 257.17

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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.