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Finding the Fourth Proportional to 627.12, 864.99 and 390.83

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Solution

The fourth proportional to 627.12, 864.99 and 390.83 is: 539.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.12 : 864.99 = 390.83 : x
  2. Step 2: Convert to fraction form
    627.12/864.99 = 390.83/x
  3. Step 3: Cross multiply
    627.12x = 864.99 × 390.83
  4. Step 4: Simplify right side
    627.12x = 338,059.72
  5. Step 5: Solve for x
    x = 338,059.72/627.12
  6. Step 6: Final answer
    x = 539.07

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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.