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Finding the Fourth Proportional to 356.20, 491.46 and 290.60

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Solution

The fourth proportional to 356.20, 491.46 and 290.60 is: 400.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.20 : 491.46 = 290.60 : x
  2. Step 2: Convert to fraction form
    356.20/491.46 = 290.60/x
  3. Step 3: Cross multiply
    356.20x = 491.46 × 290.60
  4. Step 4: Simplify right side
    356.20x = 142,818.28
  5. Step 5: Solve for x
    x = 142,818.28/356.20
  6. Step 6: Final answer
    x = 400.95

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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.