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Finding the Fourth Proportional to 713.91, 985.10 and 399.11

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Solution

The fourth proportional to 713.91, 985.10 and 399.11 is: 550.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.91 : 985.10 = 399.11 : x
  2. Step 2: Convert to fraction form
    713.91/985.10 = 399.11/x
  3. Step 3: Cross multiply
    713.91x = 985.10 × 399.11
  4. Step 4: Simplify right side
    713.91x = 393,156.34
  5. Step 5: Solve for x
    x = 393,156.34/713.91
  6. Step 6: Final answer
    x = 550.71

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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.