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Finding the Fourth Proportional to 402.19, 603.38 and 113.63

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Solution

The fourth proportional to 402.19, 603.38 and 113.63 is: 170.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.19 : 603.38 = 113.63 : x
  2. Step 2: Convert to fraction form
    402.19/603.38 = 113.63/x
  3. Step 3: Cross multiply
    402.19x = 603.38 × 113.63
  4. Step 4: Simplify right side
    402.19x = 68,559.34
  5. Step 5: Solve for x
    x = 68,559.34/402.19
  6. Step 6: Final answer
    x = 170.47

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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.