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Finding the Fourth Proportional to 517.86, 776.61 and 171.13

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Solution

The fourth proportional to 517.86, 776.61 and 171.13 is: 256.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.86 : 776.61 = 171.13 : x
  2. Step 2: Convert to fraction form
    517.86/776.61 = 171.13/x
  3. Step 3: Cross multiply
    517.86x = 776.61 × 171.13
  4. Step 4: Simplify right side
    517.86x = 132,900.41
  5. Step 5: Solve for x
    x = 132,900.41/517.86
  6. Step 6: Final answer
    x = 256.63

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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.