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Finding the Fourth Proportional to 517.76, 776.84 and 257.76

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Solution

The fourth proportional to 517.76, 776.84 and 257.76 is: 386.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.76 : 776.84 = 257.76 : x
  2. Step 2: Convert to fraction form
    517.76/776.84 = 257.76/x
  3. Step 3: Cross multiply
    517.76x = 776.84 × 257.76
  4. Step 4: Simplify right side
    517.76x = 200,238.28
  5. Step 5: Solve for x
    x = 200,238.28/517.76
  6. Step 6: Final answer
    x = 386.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.