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Finding the Fourth Proportional to 444.80, 663.78 and 390.81

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Solution

The fourth proportional to 444.80, 663.78 and 390.81 is: 583.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    444.80 : 663.78 = 390.81 : x
  2. Step 2: Convert to fraction form
    444.80/663.78 = 390.81/x
  3. Step 3: Cross multiply
    444.80x = 663.78 × 390.81
  4. Step 4: Simplify right side
    444.80x = 259,409.91
  5. Step 5: Solve for x
    x = 259,409.91/444.80
  6. Step 6: Final answer
    x = 583.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.