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Finding the Fourth Proportional to 330, 455.40 and 213.58

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Solution

The fourth proportional to 330, 455.40 and 213.58 is: 294.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    330 : 455.40 = 213.58 : x
  2. Step 2: Convert to fraction form
    330/455.40 = 213.58/x
  3. Step 3: Cross multiply
    330x = 455.40 × 213.58
  4. Step 4: Simplify right side
    330x = 97,264.33
  5. Step 5: Solve for x
    x = 97,264.33/330
  6. Step 6: Final answer
    x = 294.74

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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.