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Finding the Fourth Proportional to 518.60, 777.86 and 171.90

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Solution

The fourth proportional to 518.60, 777.86 and 171.90 is: 257.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.60 : 777.86 = 171.90 : x
  2. Step 2: Convert to fraction form
    518.60/777.86 = 171.90/x
  3. Step 3: Cross multiply
    518.60x = 777.86 × 171.90
  4. Step 4: Simplify right side
    518.60x = 133,714.13
  5. Step 5: Solve for x
    x = 133,714.13/518.60
  6. Step 6: Final answer
    x = 257.84

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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.