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Finding the Fourth Proportional to 451.80, 675.90 and 391.60

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Solution

The fourth proportional to 451.80, 675.90 and 391.60 is: 585.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.80 : 675.90 = 391.60 : x
  2. Step 2: Convert to fraction form
    451.80/675.90 = 391.60/x
  3. Step 3: Cross multiply
    451.80x = 675.90 × 391.60
  4. Step 4: Simplify right side
    451.80x = 264,682.44
  5. Step 5: Solve for x
    x = 264,682.44/451.80
  6. Step 6: Final answer
    x = 585.84

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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.