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Finding the Fourth Proportional to 501.42, 752.39 and 338.78

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Solution

The fourth proportional to 501.42, 752.39 and 338.78 is: 508.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.42 : 752.39 = 338.78 : x
  2. Step 2: Convert to fraction form
    501.42/752.39 = 338.78/x
  3. Step 3: Cross multiply
    501.42x = 752.39 × 338.78
  4. Step 4: Simplify right side
    501.42x = 254,896.14
  5. Step 5: Solve for x
    x = 254,896.14/501.42
  6. Step 6: Final answer
    x = 508.34

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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.