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Finding the Fourth Proportional to 443.45, 611.79 and 256.87

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Solution

The fourth proportional to 443.45, 611.79 and 256.87 is: 354.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.45 : 611.79 = 256.87 : x
  2. Step 2: Convert to fraction form
    443.45/611.79 = 256.87/x
  3. Step 3: Cross multiply
    443.45x = 611.79 × 256.87
  4. Step 4: Simplify right side
    443.45x = 157,151.14
  5. Step 5: Solve for x
    x = 157,151.14/443.45
  6. Step 6: Final answer
    x = 354.38

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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.