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Finding the Fourth Proportional to 400.62, 555.09 and 391.98

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Solution

The fourth proportional to 400.62, 555.09 and 391.98 is: 543.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.62 : 555.09 = 391.98 : x
  2. Step 2: Convert to fraction form
    400.62/555.09 = 391.98/x
  3. Step 3: Cross multiply
    400.62x = 555.09 × 391.98
  4. Step 4: Simplify right side
    400.62x = 217,584.18
  5. Step 5: Solve for x
    x = 217,584.18/400.62
  6. Step 6: Final answer
    x = 543.12

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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.