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Finding the Fourth Proportional to 517.98, 715.14 and 399.75

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Solution

The fourth proportional to 517.98, 715.14 and 399.75 is: 551.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.98 : 715.14 = 399.75 : x
  2. Step 2: Convert to fraction form
    517.98/715.14 = 399.75/x
  3. Step 3: Cross multiply
    517.98x = 715.14 × 399.75
  4. Step 4: Simplify right side
    517.98x = 285,877.22
  5. Step 5: Solve for x
    x = 285,877.22/517.98
  6. Step 6: Final answer
    x = 551.91

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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.