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Finding the Fourth Proportional to 445.32, 613.92 and 305.40

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Solution

The fourth proportional to 445.32, 613.92 and 305.40 is: 421.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.32 : 613.92 = 305.40 : x
  2. Step 2: Convert to fraction form
    445.32/613.92 = 305.40/x
  3. Step 3: Cross multiply
    445.32x = 613.92 × 305.40
  4. Step 4: Simplify right side
    445.32x = 187,491.17
  5. Step 5: Solve for x
    x = 187,491.17/445.32
  6. Step 6: Final answer
    x = 421.03

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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.