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Finding the Fourth Proportional to 551.20, 759.30 and 518.80

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Solution

The fourth proportional to 551.20, 759.30 and 518.80 is: 714.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.20 : 759.30 = 518.80 : x
  2. Step 2: Convert to fraction form
    551.20/759.30 = 518.80/x
  3. Step 3: Cross multiply
    551.20x = 759.30 × 518.80
  4. Step 4: Simplify right side
    551.20x = 393,924.84
  5. Step 5: Solve for x
    x = 393,924.84/551.20
  6. Step 6: Final answer
    x = 714.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.