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Finding the Fourth Proportional to 714, 985.42 and 403.50

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Solution

The fourth proportional to 714, 985.42 and 403.50 is: 556.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    714 : 985.42 = 403.50 : x
  2. Step 2: Convert to fraction form
    714/985.42 = 403.50/x
  3. Step 3: Cross multiply
    714x = 985.42 × 403.50
  4. Step 4: Simplify right side
    714x = 397,616.97
  5. Step 5: Solve for x
    x = 397,616.97/714
  6. Step 6: Final answer
    x = 556.89

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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.