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Finding the Fourth Proportional to 517.55, 776.30 and 209.32

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Solution

The fourth proportional to 517.55, 776.30 and 209.32 is: 313.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.55 : 776.30 = 209.32 : x
  2. Step 2: Convert to fraction form
    517.55/776.30 = 209.32/x
  3. Step 3: Cross multiply
    517.55x = 776.30 × 209.32
  4. Step 4: Simplify right side
    517.55x = 162,492.13
  5. Step 5: Solve for x
    x = 162,492.13/517.55
  6. Step 6: Final answer
    x = 313.97

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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.