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Finding the Fourth Proportional to 811.41, 1,119.87 and 496.86

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Solution

The fourth proportional to 811.41, 1,119.87 and 496.86 is: 685.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.41 : 1,119.87 = 496.86 : x
  2. Step 2: Convert to fraction form
    811.41/1,119.87 = 496.86/x
  3. Step 3: Cross multiply
    811.41x = 1,119.87 × 496.86
  4. Step 4: Simplify right side
    811.41x = 556,418.61
  5. Step 5: Solve for x
    x = 556,418.61/811.41
  6. Step 6: Final answer
    x = 685.74

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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.