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Finding the Fourth Proportional to 813.79, 1,122.87 and 499.11

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Solution

The fourth proportional to 813.79, 1,122.87 and 499.11 is: 688.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.79 : 1,122.87 = 499.11 : x
  2. Step 2: Convert to fraction form
    813.79/1,122.87 = 499.11/x
  3. Step 3: Cross multiply
    813.79x = 1,122.87 × 499.11
  4. Step 4: Simplify right side
    813.79x = 560,435.65
  5. Step 5: Solve for x
    x = 560,435.65/813.79
  6. Step 6: Final answer
    x = 688.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.