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Finding the Fourth Proportional to 321.60, 444.12 and 256.58

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Solution

The fourth proportional to 321.60, 444.12 and 256.58 is: 354.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.60 : 444.12 = 256.58 : x
  2. Step 2: Convert to fraction form
    321.60/444.12 = 256.58/x
  3. Step 3: Cross multiply
    321.60x = 444.12 × 256.58
  4. Step 4: Simplify right side
    321.60x = 113,952.31
  5. Step 5: Solve for x
    x = 113,952.31/321.60
  6. Step 6: Final answer
    x = 354.33

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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.