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Finding the Fourth Proportional to 508.20, 762.19 and 142.89

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Solution

The fourth proportional to 508.20, 762.19 and 142.89 is: 214.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    508.20 : 762.19 = 142.89 : x
  2. Step 2: Convert to fraction form
    508.20/762.19 = 142.89/x
  3. Step 3: Cross multiply
    508.20x = 762.19 × 142.89
  4. Step 4: Simplify right side
    508.20x = 108,906.11
  5. Step 5: Solve for x
    x = 108,906.11/508.20
  6. Step 6: Final answer
    x = 214.30

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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.