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Finding the Fourth Proportional to 402.08, 553.34 and 392.54

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Solution

The fourth proportional to 402.08, 553.34 and 392.54 is: 540.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.08 : 553.34 = 392.54 : x
  2. Step 2: Convert to fraction form
    402.08/553.34 = 392.54/x
  3. Step 3: Cross multiply
    402.08x = 553.34 × 392.54
  4. Step 4: Simplify right side
    402.08x = 217,208.08
  5. Step 5: Solve for x
    x = 217,208.08/402.08
  6. Step 6: Final answer
    x = 540.21

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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.