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Finding the Fourth Proportional to 552.42, 827.82 and 390.42

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Solution

The fourth proportional to 552.42, 827.82 and 390.42 is: 585.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    552.42 : 827.82 = 390.42 : x
  2. Step 2: Convert to fraction form
    552.42/827.82 = 390.42/x
  3. Step 3: Cross multiply
    552.42x = 827.82 × 390.42
  4. Step 4: Simplify right side
    552.42x = 323,197.48
  5. Step 5: Solve for x
    x = 323,197.48/552.42
  6. Step 6: Final answer
    x = 585.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.