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Finding the Fourth Proportional to 872.08, 1,203.43 and 499.05

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Solution

The fourth proportional to 872.08, 1,203.43 and 499.05 is: 688.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.08 : 1,203.43 = 499.05 : x
  2. Step 2: Convert to fraction form
    872.08/1,203.43 = 499.05/x
  3. Step 3: Cross multiply
    872.08x = 1,203.43 × 499.05
  4. Step 4: Simplify right side
    872.08x = 600,571.74
  5. Step 5: Solve for x
    x = 600,571.74/872.08
  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.