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Finding the Fourth Proportional to 356.15, 491.62 and 319.24

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Solution

The fourth proportional to 356.15, 491.62 and 319.24 is: 440.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.15 : 491.62 = 319.24 : x
  2. Step 2: Convert to fraction form
    356.15/491.62 = 319.24/x
  3. Step 3: Cross multiply
    356.15x = 491.62 × 319.24
  4. Step 4: Simplify right side
    356.15x = 156,945.18
  5. Step 5: Solve for x
    x = 156,945.18/356.15
  6. Step 6: Final answer
    x = 440.68

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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.