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Finding the Fourth Proportional to 342.96, 515.16 and 221.52

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Solution

The fourth proportional to 342.96, 515.16 and 221.52 is: 332.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.96 : 515.16 = 221.52 : x
  2. Step 2: Convert to fraction form
    342.96/515.16 = 221.52/x
  3. Step 3: Cross multiply
    342.96x = 515.16 × 221.52
  4. Step 4: Simplify right side
    342.96x = 114,118.24
  5. Step 5: Solve for x
    x = 114,118.24/342.96
  6. Step 6: Final answer
    x = 332.75

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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.