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Finding the Fourth Proportional to 551.26, 760.80 and 393.85

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Solution

The fourth proportional to 551.26, 760.80 and 393.85 is: 543.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.26 : 760.80 = 393.85 : x
  2. Step 2: Convert to fraction form
    551.26/760.80 = 393.85/x
  3. Step 3: Cross multiply
    551.26x = 760.80 × 393.85
  4. Step 4: Simplify right side
    551.26x = 299,641.08
  5. Step 5: Solve for x
    x = 299,641.08/551.26
  6. Step 6: Final answer
    x = 543.56

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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.