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Finding the Fourth Proportional to 627.42, 864.37 and 405.99

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Solution

The fourth proportional to 627.42, 864.37 and 405.99 is: 559.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.42 : 864.37 = 405.99 : x
  2. Step 2: Convert to fraction form
    627.42/864.37 = 405.99/x
  3. Step 3: Cross multiply
    627.42x = 864.37 × 405.99
  4. Step 4: Simplify right side
    627.42x = 350,925.58
  5. Step 5: Solve for x
    x = 350,925.58/627.42
  6. Step 6: Final answer
    x = 559.32

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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.