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Finding the Fourth Proportional to 356.60, 491.72 and 281.78

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Solution

The fourth proportional to 356.60, 491.72 and 281.78 is: 388.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.60 : 491.72 = 281.78 : x
  2. Step 2: Convert to fraction form
    356.60/491.72 = 281.78/x
  3. Step 3: Cross multiply
    356.60x = 491.72 × 281.78
  4. Step 4: Simplify right side
    356.60x = 138,552.99
  5. Step 5: Solve for x
    x = 138,552.99/356.60
  6. Step 6: Final answer
    x = 388.54

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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.