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Finding the Fourth Proportional to 812.85, 1,120.56 and 546.81

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Solution

The fourth proportional to 812.85, 1,120.56 and 546.81 is: 753.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.85 : 1,120.56 = 546.81 : x
  2. Step 2: Convert to fraction form
    812.85/1,120.56 = 546.81/x
  3. Step 3: Cross multiply
    812.85x = 1,120.56 × 546.81
  4. Step 4: Simplify right side
    812.85x = 612,733.41
  5. Step 5: Solve for x
    x = 612,733.41/812.85
  6. Step 6: Final answer
    x = 753.81

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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.