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Finding the Fourth Proportional to 355.95, 491.30 and 319.04

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Solution

The fourth proportional to 355.95, 491.30 and 319.04 is: 440.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.95 : 491.30 = 319.04 : x
  2. Step 2: Convert to fraction form
    355.95/491.30 = 319.04/x
  3. Step 3: Cross multiply
    355.95x = 491.30 × 319.04
  4. Step 4: Simplify right side
    355.95x = 156,745.58
  5. Step 5: Solve for x
    x = 156,745.58/355.95
  6. Step 6: Final answer
    x = 440.36

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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.