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Finding the Fourth Proportional to 551.98, 762.04 and 355.80

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Solution

The fourth proportional to 551.98, 762.04 and 355.80 is: 491.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.98 : 762.04 = 355.80 : x
  2. Step 2: Convert to fraction form
    551.98/762.04 = 355.80/x
  3. Step 3: Cross multiply
    551.98x = 762.04 × 355.80
  4. Step 4: Simplify right side
    551.98x = 271,133.83
  5. Step 5: Solve for x
    x = 271,133.83/551.98
  6. Step 6: Final answer
    x = 491.20

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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.