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Finding the Fourth Proportional to 402.45, 603.68 and 113.89

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Solution

The fourth proportional to 402.45, 603.68 and 113.89 is: 170.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.45 : 603.68 = 113.89 : x
  2. Step 2: Convert to fraction form
    402.45/603.68 = 113.89/x
  3. Step 3: Cross multiply
    402.45x = 603.68 × 113.89
  4. Step 4: Simplify right side
    402.45x = 68,752.55
  5. Step 5: Solve for x
    x = 68,752.55/402.45
  6. Step 6: Final answer
    x = 170.84

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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.