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Finding the Fourth Proportional to 811.42, 1,118.36 and 671.09

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Solution

The fourth proportional to 811.42, 1,118.36 and 671.09 is: 924.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.42 : 1,118.36 = 671.09 : x
  2. Step 2: Convert to fraction form
    811.42/1,118.36 = 671.09/x
  3. Step 3: Cross multiply
    811.42x = 1,118.36 × 671.09
  4. Step 4: Simplify right side
    811.42x = 750,516.30
  5. Step 5: Solve for x
    x = 750,516.30/811.42
  6. Step 6: Final answer
    x = 924.94

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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.