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Finding the Fourth Proportional to 612, 843.96 and 390.87

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Solution

The fourth proportional to 612, 843.96 and 390.87 is: 539.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    612 : 843.96 = 390.87 : x
  2. Step 2: Convert to fraction form
    612/843.96 = 390.87/x
  3. Step 3: Cross multiply
    612x = 843.96 × 390.87
  4. Step 4: Simplify right side
    612x = 329,878.65
  5. Step 5: Solve for x
    x = 329,878.65/612
  6. Step 6: Final answer
    x = 539.02

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.