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Finding the Fourth Proportional to 883.53, 1,218.78 and 820.96

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Solution

The fourth proportional to 883.53, 1,218.78 and 820.96 is: 1,132.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.53 : 1,218.78 = 820.96 : x
  2. Step 2: Convert to fraction form
    883.53/1,218.78 = 820.96/x
  3. Step 3: Cross multiply
    883.53x = 1,218.78 × 820.96
  4. Step 4: Simplify right side
    883.53x = 1,000,566.58
  5. Step 5: Solve for x
    x = 1,000,566.58/883.53
  6. Step 6: Final answer
    x = 1,132.46

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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.