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Finding the Fourth Proportional to 342.01, 512.90 and 211.81

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Solution

The fourth proportional to 342.01, 512.90 and 211.81 is: 317.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.01 : 512.90 = 211.81 : x
  2. Step 2: Convert to fraction form
    342.01/512.90 = 211.81/x
  3. Step 3: Cross multiply
    342.01x = 512.90 × 211.81
  4. Step 4: Simplify right side
    342.01x = 108,637.35
  5. Step 5: Solve for x
    x = 108,637.35/342.01
  6. Step 6: Final answer
    x = 317.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.