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Finding the Fourth Proportional to 400.56, 555.60 and 385.98

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Solution

The fourth proportional to 400.56, 555.60 and 385.98 is: 535.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.56 : 555.60 = 385.98 : x
  2. Step 2: Convert to fraction form
    400.56/555.60 = 385.98/x
  3. Step 3: Cross multiply
    400.56x = 555.60 × 385.98
  4. Step 4: Simplify right side
    400.56x = 214,450.49
  5. Step 5: Solve for x
    x = 214,450.49/400.56
  6. Step 6: Final answer
    x = 535.38

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.