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Finding the Fourth Proportional to 517.80, 714.56 and 281.75

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Solution

The fourth proportional to 517.80, 714.56 and 281.75 is: 388.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.80 : 714.56 = 281.75 : x
  2. Step 2: Convert to fraction form
    517.80/714.56 = 281.75/x
  3. Step 3: Cross multiply
    517.80x = 714.56 × 281.75
  4. Step 4: Simplify right side
    517.80x = 201,327.28
  5. Step 5: Solve for x
    x = 201,327.28/517.80
  6. Step 6: Final answer
    x = 388.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.