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Finding the Fourth Proportional to 344.64, 516.65 and 128.07

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Solution

The fourth proportional to 344.64, 516.65 and 128.07 is: 191.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    344.64 : 516.65 = 128.07 : x
  2. Step 2: Convert to fraction form
    344.64/516.65 = 128.07/x
  3. Step 3: Cross multiply
    344.64x = 516.65 × 128.07
  4. Step 4: Simplify right side
    344.64x = 66,166.73
  5. Step 5: Solve for x
    x = 66,166.73/344.64
  6. Step 6: Final answer
    x = 191.99

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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.