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Finding the Fourth Proportional to 400.44, 551.79 and 307.18

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Solution

The fourth proportional to 400.44, 551.79 and 307.18 is: 423.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.44 : 551.79 = 307.18 : x
  2. Step 2: Convert to fraction form
    400.44/551.79 = 307.18/x
  3. Step 3: Cross multiply
    400.44x = 551.79 × 307.18
  4. Step 4: Simplify right side
    400.44x = 169,498.85
  5. Step 5: Solve for x
    x = 169,498.85/400.44
  6. Step 6: Final answer
    x = 423.28

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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.