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Finding the Fourth Proportional to 356.50, 491.21 and 239.86

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Solution

The fourth proportional to 356.50, 491.21 and 239.86 is: 330.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.50 : 491.21 = 239.86 : x
  2. Step 2: Convert to fraction form
    356.50/491.21 = 239.86/x
  3. Step 3: Cross multiply
    356.50x = 491.21 × 239.86
  4. Step 4: Simplify right side
    356.50x = 117,820.43
  5. Step 5: Solve for x
    x = 117,820.43/356.50
  6. Step 6: Final answer
    x = 330.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.