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Finding the Fourth Proportional to 714.87, 1,072.17 and 398.39

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Solution

The fourth proportional to 714.87, 1,072.17 and 398.39 is: 597.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.87 : 1,072.17 = 398.39 : x
  2. Step 2: Convert to fraction form
    714.87/1,072.17 = 398.39/x
  3. Step 3: Cross multiply
    714.87x = 1,072.17 × 398.39
  4. Step 4: Simplify right side
    714.87x = 427,136.45
  5. Step 5: Solve for x
    x = 427,136.45/714.87
  6. Step 6: Final answer
    x = 597.50

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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.