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Finding the Fourth Proportional to 663.01, 994.50 and 390.82

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Solution

The fourth proportional to 663.01, 994.50 and 390.82 is: 586.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.01 : 994.50 = 390.82 : x
  2. Step 2: Convert to fraction form
    663.01/994.50 = 390.82/x
  3. Step 3: Cross multiply
    663.01x = 994.50 × 390.82
  4. Step 4: Simplify right side
    663.01x = 388,670.49
  5. Step 5: Solve for x
    x = 388,670.49/663.01
  6. Step 6: Final answer
    x = 586.22

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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.