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Finding the Fourth Proportional to 400.16, 551.36 and 288.05

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Solution

The fourth proportional to 400.16, 551.36 and 288.05 is: 396.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.16 : 551.36 = 288.05 : x
  2. Step 2: Convert to fraction form
    400.16/551.36 = 288.05/x
  3. Step 3: Cross multiply
    400.16x = 551.36 × 288.05
  4. Step 4: Simplify right side
    400.16x = 158,817.21
  5. Step 5: Solve for x
    x = 158,817.21/400.16
  6. Step 6: Final answer
    x = 396.88

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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.