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Finding the Fourth Proportional to 445.55, 615 and 305.61

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Solution

The fourth proportional to 445.55, 615 and 305.61 is: 421.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.55 : 615 = 305.61 : x
  2. Step 2: Convert to fraction form
    445.55/615 = 305.61/x
  3. Step 3: Cross multiply
    445.55x = 615 × 305.61
  4. Step 4: Simplify right side
    445.55x = 187,950.15
  5. Step 5: Solve for x
    x = 187,950.15/445.55
  6. Step 6: Final answer
    x = 421.84

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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.