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Finding the Fourth Proportional to 517.70, 714.42 and 281.66

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Solution

The fourth proportional to 517.70, 714.42 and 281.66 is: 388.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.70 : 714.42 = 281.66 : x
  2. Step 2: Convert to fraction form
    517.70/714.42 = 281.66/x
  3. Step 3: Cross multiply
    517.70x = 714.42 × 281.66
  4. Step 4: Simplify right side
    517.70x = 201,219.77
  5. Step 5: Solve for x
    x = 201,219.77/517.70
  6. Step 6: Final answer
    x = 388.68

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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.