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Finding the Fourth Proportional to 812.92, 1,121.86 and 498.12

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Solution

The fourth proportional to 812.92, 1,121.86 and 498.12 is: 687.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.92 : 1,121.86 = 498.12 : x
  2. Step 2: Convert to fraction form
    812.92/1,121.86 = 498.12/x
  3. Step 3: Cross multiply
    812.92x = 1,121.86 × 498.12
  4. Step 4: Simplify right side
    812.92x = 558,820.90
  5. Step 5: Solve for x
    x = 558,820.90/812.92
  6. Step 6: Final answer
    x = 687.42

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1.5x scale

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.