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Finding the Fourth Proportional to 315.05, 434.78 and 210.33

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Solution

The fourth proportional to 315.05, 434.78 and 210.33 is: 290.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.05 : 434.78 = 210.33 : x
  2. Step 2: Convert to fraction form
    315.05/434.78 = 210.33/x
  3. Step 3: Cross multiply
    315.05x = 434.78 × 210.33
  4. Step 4: Simplify right side
    315.05x = 91,447.28
  5. Step 5: Solve for x
    x = 91,447.28/315.05
  6. Step 6: Final answer
    x = 290.26

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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.