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Finding the Fourth Proportional to 627.12, 864.96 and 405.99

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Solution

The fourth proportional to 627.12, 864.96 and 405.99 is: 559.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.12 : 864.96 = 405.99 : x
  2. Step 2: Convert to fraction form
    627.12/864.96 = 405.99/x
  3. Step 3: Cross multiply
    627.12x = 864.96 × 405.99
  4. Step 4: Simplify right side
    627.12x = 351,165.11
  5. Step 5: Solve for x
    x = 351,165.11/627.12
  6. Step 6: Final answer
    x = 559.96

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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.