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Finding the Fourth Proportional to 402.40, 555.16 and 236.56

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Solution

The fourth proportional to 402.40, 555.16 and 236.56 is: 326.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.40 : 555.16 = 236.56 : x
  2. Step 2: Convert to fraction form
    402.40/555.16 = 236.56/x
  3. Step 3: Cross multiply
    402.40x = 555.16 × 236.56
  4. Step 4: Simplify right side
    402.40x = 131,328.65
  5. Step 5: Solve for x
    x = 131,328.65/402.40
  6. Step 6: Final answer
    x = 326.36

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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.