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Finding the Fourth Proportional to 599.64, 827.60 and 390.43

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Solution

The fourth proportional to 599.64, 827.60 and 390.43 is: 538.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    599.64 : 827.60 = 390.43 : x
  2. Step 2: Convert to fraction form
    599.64/827.60 = 390.43/x
  3. Step 3: Cross multiply
    599.64x = 827.60 × 390.43
  4. Step 4: Simplify right side
    599.64x = 323,119.87
  5. Step 5: Solve for x
    x = 323,119.87/599.64
  6. Step 6: Final answer
    x = 538.86

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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.