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Finding the Fourth Proportional to 402.12, 554.91 and 236.40

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Solution

The fourth proportional to 402.12, 554.91 and 236.40 is: 326.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.12 : 554.91 = 236.40 : x
  2. Step 2: Convert to fraction form
    402.12/554.91 = 236.40/x
  3. Step 3: Cross multiply
    402.12x = 554.91 × 236.40
  4. Step 4: Simplify right side
    402.12x = 131,180.72
  5. Step 5: Solve for x
    x = 131,180.72/402.12
  6. Step 6: Final answer
    x = 326.22

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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.