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Finding the Fourth Proportional to 399.65, 551.39 and 316.49

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Solution

The fourth proportional to 399.65, 551.39 and 316.49 is: 436.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.65 : 551.39 = 316.49 : x
  2. Step 2: Convert to fraction form
    399.65/551.39 = 316.49/x
  3. Step 3: Cross multiply
    399.65x = 551.39 × 316.49
  4. Step 4: Simplify right side
    399.65x = 174,505.08
  5. Step 5: Solve for x
    x = 174,505.08/399.65
  6. Step 6: Final answer
    x = 436.65

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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.