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Finding the Fourth Proportional to 444.86, 664.70 and 391.40

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Solution

The fourth proportional to 444.86, 664.70 and 391.40 is: 584.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    444.86 : 664.70 = 391.40 : x
  2. Step 2: Convert to fraction form
    444.86/664.70 = 391.40/x
  3. Step 3: Cross multiply
    444.86x = 664.70 × 391.40
  4. Step 4: Simplify right side
    444.86x = 260,163.58
  5. Step 5: Solve for x
    x = 260,163.58/444.86
  6. Step 6: Final answer
    x = 584.82

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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.