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Finding the Fourth Proportional to 663.95, 994.85 and 390.27

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Solution

The fourth proportional to 663.95, 994.85 and 390.27 is: 584.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.95 : 994.85 = 390.27 : x
  2. Step 2: Convert to fraction form
    663.95/994.85 = 390.27/x
  3. Step 3: Cross multiply
    663.95x = 994.85 × 390.27
  4. Step 4: Simplify right side
    663.95x = 388,258.16
  5. Step 5: Solve for x
    x = 388,258.16/663.95
  6. Step 6: Final answer
    x = 584.77

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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.