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Finding the Fourth Proportional to 330.36, 455.58 and 305.22

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Solution

The fourth proportional to 330.36, 455.58 and 305.22 is: 420.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.36 : 455.58 = 305.22 : x
  2. Step 2: Convert to fraction form
    330.36/455.58 = 305.22/x
  3. Step 3: Cross multiply
    330.36x = 455.58 × 305.22
  4. Step 4: Simplify right side
    330.36x = 139,052.13
  5. Step 5: Solve for x
    x = 139,052.13/330.36
  6. Step 6: Final answer
    x = 420.91

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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.