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Finding the Fourth Proportional to 315.86, 435.84 and 199.49

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Solution

The fourth proportional to 315.86, 435.84 and 199.49 is: 275.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.86 : 435.84 = 199.49 : x
  2. Step 2: Convert to fraction form
    315.86/435.84 = 199.49/x
  3. Step 3: Cross multiply
    315.86x = 435.84 × 199.49
  4. Step 4: Simplify right side
    315.86x = 86,943.54
  5. Step 5: Solve for x
    x = 86,943.54/315.86
  6. Step 6: Final answer
    x = 275.26

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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.