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Finding the Fourth Proportional to 326.64, 450.90 and 256.89

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Solution

The fourth proportional to 326.64, 450.90 and 256.89 is: 354.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.64 : 450.90 = 256.89 : x
  2. Step 2: Convert to fraction form
    326.64/450.90 = 256.89/x
  3. Step 3: Cross multiply
    326.64x = 450.90 × 256.89
  4. Step 4: Simplify right side
    326.64x = 115,831.70
  5. Step 5: Solve for x
    x = 115,831.70/326.64
  6. Step 6: Final answer
    x = 354.62

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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.