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Finding the Fourth Proportional to 326.76, 450.90 and 285.30

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Solution

The fourth proportional to 326.76, 450.90 and 285.30 is: 393.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.76 : 450.90 = 285.30 : x
  2. Step 2: Convert to fraction form
    326.76/450.90 = 285.30/x
  3. Step 3: Cross multiply
    326.76x = 450.90 × 285.30
  4. Step 4: Simplify right side
    326.76x = 128,641.77
  5. Step 5: Solve for x
    x = 128,641.77/326.76
  6. Step 6: Final answer
    x = 393.69

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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.