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Finding the Fourth Proportional to 512.79, 767.95 and 281.34

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Solution

The fourth proportional to 512.79, 767.95 and 281.34 is: 421.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.79 : 767.95 = 281.34 : x
  2. Step 2: Convert to fraction form
    512.79/767.95 = 281.34/x
  3. Step 3: Cross multiply
    512.79x = 767.95 × 281.34
  4. Step 4: Simplify right side
    512.79x = 216,055.05
  5. Step 5: Solve for x
    x = 216,055.05/512.79
  6. Step 6: Final answer
    x = 421.33

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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.