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Finding the Fourth Proportional to 354.70, 531.99 and 98.20

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Solution

The fourth proportional to 354.70, 531.99 and 98.20 is: 147.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.70 : 531.99 = 98.20 : x
  2. Step 2: Convert to fraction form
    354.70/531.99 = 98.20/x
  3. Step 3: Cross multiply
    354.70x = 531.99 × 98.20
  4. Step 4: Simplify right side
    354.70x = 52,241.42
  5. Step 5: Solve for x
    x = 52,241.42/354.70
  6. Step 6: Final answer
    x = 147.28

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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.