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Finding the Fourth Proportional to 283.72, 425.78 and 129.66

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Solution

The fourth proportional to 283.72, 425.78 and 129.66 is: 194.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.72 : 425.78 = 129.66 : x
  2. Step 2: Convert to fraction form
    283.72/425.78 = 129.66/x
  3. Step 3: Cross multiply
    283.72x = 425.78 × 129.66
  4. Step 4: Simplify right side
    283.72x = 55,206.63
  5. Step 5: Solve for x
    x = 55,206.63/283.72
  6. Step 6: Final answer
    x = 194.58

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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.