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Finding the Fourth Proportional to 551.76, 761 and 391.98

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Solution

The fourth proportional to 551.76, 761 and 391.98 is: 540.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.76 : 761 = 391.98 : x
  2. Step 2: Convert to fraction form
    551.76/761 = 391.98/x
  3. Step 3: Cross multiply
    551.76x = 761 × 391.98
  4. Step 4: Simplify right side
    551.76x = 298,296.78
  5. Step 5: Solve for x
    x = 298,296.78/551.76
  6. Step 6: Final answer
    x = 540.63

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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.