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Finding the Fourth Proportional to 518.60, 777.68 and 172.02

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Solution

The fourth proportional to 518.60, 777.68 and 172.02 is: 257.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.60 : 777.68 = 172.02 : x
  2. Step 2: Convert to fraction form
    518.60/777.68 = 172.02/x
  3. Step 3: Cross multiply
    518.60x = 777.68 × 172.02
  4. Step 4: Simplify right side
    518.60x = 133,775.65
  5. Step 5: Solve for x
    x = 133,775.65/518.60
  6. Step 6: Final answer
    x = 257.96

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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.