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Finding the Fourth Proportional to 285.58, 393.69 and 256.42

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Solution

The fourth proportional to 285.58, 393.69 and 256.42 is: 353.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.58 : 393.69 = 256.42 : x
  2. Step 2: Convert to fraction form
    285.58/393.69 = 256.42/x
  3. Step 3: Cross multiply
    285.58x = 393.69 × 256.42
  4. Step 4: Simplify right side
    285.58x = 100,949.99
  5. Step 5: Solve for x
    x = 100,949.99/285.58
  6. Step 6: Final answer
    x = 353.49

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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.