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Finding the Fourth Proportional to 517.68, 775.46 and 386.17

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Solution

The fourth proportional to 517.68, 775.46 and 386.17 is: 578.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.68 : 775.46 = 386.17 : x
  2. Step 2: Convert to fraction form
    517.68/775.46 = 386.17/x
  3. Step 3: Cross multiply
    517.68x = 775.46 × 386.17
  4. Step 4: Simplify right side
    517.68x = 299,458.41
  5. Step 5: Solve for x
    x = 299,458.41/517.68
  6. Step 6: Final answer
    x = 578.46

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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.