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Finding the Fourth Proportional to 445.56, 615.12 and 305.76

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Solution

The fourth proportional to 445.56, 615.12 and 305.76 is: 422.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.56 : 615.12 = 305.76 : x
  2. Step 2: Convert to fraction form
    445.56/615.12 = 305.76/x
  3. Step 3: Cross multiply
    445.56x = 615.12 × 305.76
  4. Step 4: Simplify right side
    445.56x = 188,079.09
  5. Step 5: Solve for x
    x = 188,079.09/445.56
  6. Step 6: Final answer
    x = 422.12

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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.