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Finding the Fourth Proportional to 342.51, 513.65 and 212.31

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Solution

The fourth proportional to 342.51, 513.65 and 212.31 is: 318.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.51 : 513.65 = 212.31 : x
  2. Step 2: Convert to fraction form
    342.51/513.65 = 212.31/x
  3. Step 3: Cross multiply
    342.51x = 513.65 × 212.31
  4. Step 4: Simplify right side
    342.51x = 109,051.97
  5. Step 5: Solve for x
    x = 109,051.97/342.51
  6. Step 6: Final answer
    x = 318.39

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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.