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Finding the Fourth Proportional to 517.07, 776.16 and 257.28

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Solution

The fourth proportional to 517.07, 776.16 and 257.28 is: 386.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.07 : 776.16 = 257.28 : x
  2. Step 2: Convert to fraction form
    517.07/776.16 = 257.28/x
  3. Step 3: Cross multiply
    517.07x = 776.16 × 257.28
  4. Step 4: Simplify right side
    517.07x = 199,690.44
  5. Step 5: Solve for x
    x = 199,690.44/517.07
  6. Step 6: Final answer
    x = 386.20

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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.