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Finding the Fourth Proportional to 345.16, 516.65 and 221.59

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Solution

The fourth proportional to 345.16, 516.65 and 221.59 is: 331.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.16 : 516.65 = 221.59 : x
  2. Step 2: Convert to fraction form
    345.16/516.65 = 221.59/x
  3. Step 3: Cross multiply
    345.16x = 516.65 × 221.59
  4. Step 4: Simplify right side
    345.16x = 114,485.46
  5. Step 5: Solve for x
    x = 114,485.46/345.16
  6. Step 6: Final answer
    x = 331.69

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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.