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Finding the Fourth Proportional to 443.64, 612.09 and 257.12

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Solution

The fourth proportional to 443.64, 612.09 and 257.12 is: 354.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.64 : 612.09 = 257.12 : x
  2. Step 2: Convert to fraction form
    443.64/612.09 = 257.12/x
  3. Step 3: Cross multiply
    443.64x = 612.09 × 257.12
  4. Step 4: Simplify right side
    443.64x = 157,377.52
  5. Step 5: Solve for x
    x = 157,377.52/443.64
  6. Step 6: Final answer
    x = 354.74

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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.