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Finding the Fourth Proportional to 330.28, 454.62 and 305.98

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Solution

The fourth proportional to 330.28, 454.62 and 305.98 is: 421.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.28 : 454.62 = 305.98 : x
  2. Step 2: Convert to fraction form
    330.28/454.62 = 305.98/x
  3. Step 3: Cross multiply
    330.28x = 454.62 × 305.98
  4. Step 4: Simplify right side
    330.28x = 139,104.63
  5. Step 5: Solve for x
    x = 139,104.63/330.28
  6. Step 6: Final answer
    x = 421.17

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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.