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Finding the Fourth Proportional to 714.11, 985.50 and 399.38

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Solution

The fourth proportional to 714.11, 985.50 and 399.38 is: 551.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.11 : 985.50 = 399.38 : x
  2. Step 2: Convert to fraction form
    714.11/985.50 = 399.38/x
  3. Step 3: Cross multiply
    714.11x = 985.50 × 399.38
  4. Step 4: Simplify right side
    714.11x = 393,584.06
  5. Step 5: Solve for x
    x = 393,584.06/714.11
  6. Step 6: Final answer
    x = 551.16

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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.