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Finding the Fourth Proportional to 451.84, 674.48 and 391.20

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Solution

The fourth proportional to 451.84, 674.48 and 391.20 is: 583.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.84 : 674.48 = 391.20 : x
  2. Step 2: Convert to fraction form
    451.84/674.48 = 391.20/x
  3. Step 3: Cross multiply
    451.84x = 674.48 × 391.20
  4. Step 4: Simplify right side
    451.84x = 263,856.58
  5. Step 5: Solve for x
    x = 263,856.58/451.84
  6. Step 6: Final answer
    x = 583.96

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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.