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Finding the Fourth Proportional to 872.84, 1,205.48 and 818.58

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Solution

The fourth proportional to 872.84, 1,205.48 and 818.58 is: 1,130.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.84 : 1,205.48 = 818.58 : x
  2. Step 2: Convert to fraction form
    872.84/1,205.48 = 818.58/x
  3. Step 3: Cross multiply
    872.84x = 1,205.48 × 818.58
  4. Step 4: Simplify right side
    872.84x = 986,781.82
  5. Step 5: Solve for x
    x = 986,781.82/872.84
  6. Step 6: Final answer
    x = 1,130.54

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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.