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Finding the Fourth Proportional to 832.11, 1,247.76 and 485.55

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Solution

The fourth proportional to 832.11, 1,247.76 and 485.55 is: 728.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    832.11 : 1,247.76 = 485.55 : x
  2. Step 2: Convert to fraction form
    832.11/1,247.76 = 485.55/x
  3. Step 3: Cross multiply
    832.11x = 1,247.76 × 485.55
  4. Step 4: Simplify right side
    832.11x = 605,849.87
  5. Step 5: Solve for x
    x = 605,849.87/832.11
  6. Step 6: Final answer
    x = 728.09

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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.