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Finding the Fourth Proportional to 662.13, 993.18 and 389.95

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Solution

The fourth proportional to 662.13, 993.18 and 389.95 is: 584.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.13 : 993.18 = 389.95 : x
  2. Step 2: Convert to fraction form
    662.13/993.18 = 389.95/x
  3. Step 3: Cross multiply
    662.13x = 993.18 × 389.95
  4. Step 4: Simplify right side
    662.13x = 387,288.06
  5. Step 5: Solve for x
    x = 387,288.06/662.13
  6. Step 6: Final answer
    x = 584.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.