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Finding the Fourth Proportional to 445.11, 614.61 and 351.78

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Solution

The fourth proportional to 445.11, 614.61 and 351.78 is: 485.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.11 : 614.61 = 351.78 : x
  2. Step 2: Convert to fraction form
    445.11/614.61 = 351.78/x
  3. Step 3: Cross multiply
    445.11x = 614.61 × 351.78
  4. Step 4: Simplify right side
    445.11x = 216,207.51
  5. Step 5: Solve for x
    x = 216,207.51/445.11
  6. Step 6: Final answer
    x = 485.74

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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.