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Finding the Fourth Proportional to 517.40, 776.18 and 257.42

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Solution

The fourth proportional to 517.40, 776.18 and 257.42 is: 386.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.40 : 776.18 = 257.42 : x
  2. Step 2: Convert to fraction form
    517.40/776.18 = 257.42/x
  3. Step 3: Cross multiply
    517.40x = 776.18 × 257.42
  4. Step 4: Simplify right side
    517.40x = 199,799.09
  5. Step 5: Solve for x
    x = 199,799.09/517.40
  6. Step 6: Final answer
    x = 386.16

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Similar ratio
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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.