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Finding the Fourth Proportional to 723.63, 998.55 and 408.90

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Solution

The fourth proportional to 723.63, 998.55 and 408.90 is: 564.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.63 : 998.55 = 408.90 : x
  2. Step 2: Convert to fraction form
    723.63/998.55 = 408.90/x
  3. Step 3: Cross multiply
    723.63x = 998.55 × 408.90
  4. Step 4: Simplify right side
    723.63x = 408,307.10
  5. Step 5: Solve for x
    x = 408,307.10/723.63
  6. Step 6: Final answer
    x = 564.25

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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.