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Finding the Fourth Proportional to 812.85, 1,121.75 and 458.74

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Solution

The fourth proportional to 812.85, 1,121.75 and 458.74 is: 633.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.85 : 1,121.75 = 458.74 : x
  2. Step 2: Convert to fraction form
    812.85/1,121.75 = 458.74/x
  3. Step 3: Cross multiply
    812.85x = 1,121.75 × 458.74
  4. Step 4: Simplify right side
    812.85x = 514,591.60
  5. Step 5: Solve for x
    x = 514,591.60/812.85
  6. Step 6: Final answer
    x = 633.07

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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.