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Finding the Fourth Proportional to 357.71, 493.20 and 287.78

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Solution

The fourth proportional to 357.71, 493.20 and 287.78 is: 396.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.71 : 493.20 = 287.78 : x
  2. Step 2: Convert to fraction form
    357.71/493.20 = 287.78/x
  3. Step 3: Cross multiply
    357.71x = 493.20 × 287.78
  4. Step 4: Simplify right side
    357.71x = 141,930.63
  5. Step 5: Solve for x
    x = 141,930.63/357.71
  6. Step 6: Final answer
    x = 396.77

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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.