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Finding the Fourth Proportional to 811.29, 1,213.58 and 614.81

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Solution

The fourth proportional to 811.29, 1,213.58 and 614.81 is: 919.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.29 : 1,213.58 = 614.81 : x
  2. Step 2: Convert to fraction form
    811.29/1,213.58 = 614.81/x
  3. Step 3: Cross multiply
    811.29x = 1,213.58 × 614.81
  4. Step 4: Simplify right side
    811.29x = 746,121.12
  5. Step 5: Solve for x
    x = 746,121.12/811.29
  6. Step 6: Final answer
    x = 919.67

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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.