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Finding the Fourth Proportional to 442.79, 611.03 and 256.28

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Solution

The fourth proportional to 442.79, 611.03 and 256.28 is: 353.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.79 : 611.03 = 256.28 : x
  2. Step 2: Convert to fraction form
    442.79/611.03 = 256.28/x
  3. Step 3: Cross multiply
    442.79x = 611.03 × 256.28
  4. Step 4: Simplify right side
    442.79x = 156,590.43
  5. Step 5: Solve for x
    x = 156,590.43/442.79
  6. Step 6: Final answer
    x = 353.65

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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.