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Finding the Fourth Proportional to 400.36, 551.28 and 289.62

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Solution

The fourth proportional to 400.36, 551.28 and 289.62 is: 398.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.36 : 551.28 = 289.62 : x
  2. Step 2: Convert to fraction form
    400.36/551.28 = 289.62/x
  3. Step 3: Cross multiply
    400.36x = 551.28 × 289.62
  4. Step 4: Simplify right side
    400.36x = 159,661.71
  5. Step 5: Solve for x
    x = 159,661.71/400.36
  6. Step 6: Final answer
    x = 398.80

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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.