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Finding the Fourth Proportional to 551.20, 762.60 and 482.40

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Solution

The fourth proportional to 551.20, 762.60 and 482.40 is: 667.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.20 : 762.60 = 482.40 : x
  2. Step 2: Convert to fraction form
    551.20/762.60 = 482.40/x
  3. Step 3: Cross multiply
    551.20x = 762.60 × 482.40
  4. Step 4: Simplify right side
    551.20x = 367,878.24
  5. Step 5: Solve for x
    x = 367,878.24/551.20
  6. Step 6: Final answer
    x = 667.41

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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.