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Finding the Fourth Proportional to 333.12, 459.20 and 305.28

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Solution

The fourth proportional to 333.12, 459.20 and 305.28 is: 420.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    333.12 : 459.20 = 305.28 : x
  2. Step 2: Convert to fraction form
    333.12/459.20 = 305.28/x
  3. Step 3: Cross multiply
    333.12x = 459.20 × 305.28
  4. Step 4: Simplify right side
    333.12x = 140,184.58
  5. Step 5: Solve for x
    x = 140,184.58/333.12
  6. Step 6: Final answer
    x = 420.82

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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.