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Finding the Fourth Proportional to 811.59, 1,216.49 and 518.16

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Solution

The fourth proportional to 811.59, 1,216.49 and 518.16 is: 776.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.59 : 1,216.49 = 518.16 : x
  2. Step 2: Convert to fraction form
    811.59/1,216.49 = 518.16/x
  3. Step 3: Cross multiply
    811.59x = 1,216.49 × 518.16
  4. Step 4: Simplify right side
    811.59x = 630,338.43
  5. Step 5: Solve for x
    x = 630,338.43/811.59
  6. Step 6: Final answer
    x = 776.67

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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.