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Finding the Fourth Proportional to 443.05, 611.47 and 256.48

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Solution

The fourth proportional to 443.05, 611.47 and 256.48 is: 353.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.05 : 611.47 = 256.48 : x
  2. Step 2: Convert to fraction form
    443.05/611.47 = 256.48/x
  3. Step 3: Cross multiply
    443.05x = 611.47 × 256.48
  4. Step 4: Simplify right side
    443.05x = 156,829.18
  5. Step 5: Solve for x
    x = 156,829.18/443.05
  6. Step 6: Final answer
    x = 353.98

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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.