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Finding the Fourth Proportional to 402.67, 603.89 and 142.63

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Solution

The fourth proportional to 402.67, 603.89 and 142.63 is: 213.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.67 : 603.89 = 142.63 : x
  2. Step 2: Convert to fraction form
    402.67/603.89 = 142.63/x
  3. Step 3: Cross multiply
    402.67x = 603.89 × 142.63
  4. Step 4: Simplify right side
    402.67x = 86,134.81
  5. Step 5: Solve for x
    x = 86,134.81/402.67
  6. Step 6: Final answer
    x = 213.91

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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.