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Finding the Fourth Proportional to 814.68, 1,220.58 and 765.96

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Solution

The fourth proportional to 814.68, 1,220.58 and 765.96 is: 1,147.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.68 : 1,220.58 = 765.96 : x
  2. Step 2: Convert to fraction form
    814.68/1,220.58 = 765.96/x
  3. Step 3: Cross multiply
    814.68x = 1,220.58 × 765.96
  4. Step 4: Simplify right side
    814.68x = 934,915.46
  5. Step 5: Solve for x
    x = 934,915.46/814.68
  6. Step 6: Final answer
    x = 1,147.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.