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Finding the Fourth Proportional to 444.55, 663.40 and 390.56

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Solution

The fourth proportional to 444.55, 663.40 and 390.56 is: 582.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    444.55 : 663.40 = 390.56 : x
  2. Step 2: Convert to fraction form
    444.55/663.40 = 390.56/x
  3. Step 3: Cross multiply
    444.55x = 663.40 × 390.56
  4. Step 4: Simplify right side
    444.55x = 259,097.50
  5. Step 5: Solve for x
    x = 259,097.50/444.55
  6. Step 6: Final answer
    x = 582.83

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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.