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Finding the Fourth Proportional to 356.20, 492.30 and 329.50

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Solution

The fourth proportional to 356.20, 492.30 and 329.50 is: 455.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.20 : 492.30 = 329.50 : x
  2. Step 2: Convert to fraction form
    356.20/492.30 = 329.50/x
  3. Step 3: Cross multiply
    356.20x = 492.30 × 329.50
  4. Step 4: Simplify right side
    356.20x = 162,212.85
  5. Step 5: Solve for x
    x = 162,212.85/356.20
  6. Step 6: Final answer
    x = 455.40

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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.