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Finding the Fourth Proportional to 211.81, 316.34 and 210.43

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Solution

The fourth proportional to 211.81, 316.34 and 210.43 is: 314.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.81 : 316.34 = 210.43 : x
  2. Step 2: Convert to fraction form
    211.81/316.34 = 210.43/x
  3. Step 3: Cross multiply
    211.81x = 316.34 × 210.43
  4. Step 4: Simplify right side
    211.81x = 66,567.43
  5. Step 5: Solve for x
    x = 66,567.43/211.81
  6. Step 6: Final answer
    x = 314.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.