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Finding the Fourth Proportional to 354.40, 531.44 and 208.30

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Solution

The fourth proportional to 354.40, 531.44 and 208.30 is: 312.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.40 : 531.44 = 208.30 : x
  2. Step 2: Convert to fraction form
    354.40/531.44 = 208.30/x
  3. Step 3: Cross multiply
    354.40x = 531.44 × 208.30
  4. Step 4: Simplify right side
    354.40x = 110,698.95
  5. Step 5: Solve for x
    x = 110,698.95/354.40
  6. Step 6: Final answer
    x = 312.36

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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.